Method and apparatus for neuroenhancement

ABSTRACT

A method of facilitating a skill learning process or improving performance of a task, comprising: determining a brainwave pattern reflecting neuronal activity of a skilled subject while engaged in a respective skill or task; processing the determined brainwave pattern with at least one automated processor; and subjecting a subject training in the respective skill or task to brain entrainment by a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral excitation, a transcranial excitation, and a deep brain stimulation, dependent on the processed temporal pattern extracted from brainwaves reflecting neuronal activity of the skilled subject.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims benefit of priority from U.S. Provisional Application No. 62/560,502, filed Sep. 19, 2017, and from U.S. Provisional Application No. 62/568,610, filed Oct. 5, 2017, and from U.S. Provisional Application No. 62/594,452, filed Dec. 4, 2017, each of which is expressly incorporated herein in its entirety, including any references cited therein. Each reference and document cited herein is expressly incorporated herein by reference in its entirety, for all purposes.

FIELD OF THE INVENTION

The present invention generally relates to the field of neuroenhancement and more specifically to systems and methods for determining brain activity patterns corresponding to tasks, and inducing brain activity patterns of the desired type in a subject through, inter alia, brain entrainment.

BACKGROUND OF THE INVENTION

Brain—The brain is a key part of the central nervous system, enclosed in the skull. In humans, and mammals more generally, the brain controls both autonomic processes, as well as cognitive processes. The brain (and to a lesser extent, the spinal cord) controls all volitional functions of the body and interprets information from the outside world. Intelligence, memory, emotions, speech, thoughts, movements and creativity are controlled by the brain. The central nervous system also controls autonomic functions and many homeostatic and reflex actions, such as breathing, heart rate, etc. The human brain consists of the cerebrum, cerebellum, and brainstem. The brainstem includes the midbrain, the pons, and the medulla oblongata. Sometimes the diencephalon, the caudal part of the forebrain, is included.

The brainstem provides the main motor and sensory innervation to the face and neck via the cranial nerves. Of the twelve pairs of cranial nerves, ten pairs come from the brainstem. This is an extremely important part of the brain, as the nerve connections of the motor and sensory systems from the main part of the brain to the rest of the body pass through the brainstem. This includes the corticospinal tract (motor), the posterior column-medial lemniscus pathway (fine touch, vibration sensation, and proprioception), and the spinothalamic tract (pain, temperature, itch, and crude touch). The brainstem also plays an important role in the regulation of cardiac and respiratory function. It also regulates the central nervous system and is pivotal in maintaining consciousness and regulating the sleep cycle. The brainstem has many basic functions including heart rate, breathing, sleeping, and eating. The skull imposes a barrier to electrical access to the brain functions, and in a healthy human, breaching the dura to access the brain is highly disfavored. The result is that electrical readings of brain activity are filtered by the dura, the cerebrospinal fluid, the skull, the scalp, skin appendages (e.g., hair), resulting in a loss of potential spatial resolution and amplitude of signals emanating from the brain. While magnetic fields resulting from brain electrical activity are accessible, the spatial resolution using feasible sensors is also limited.

The brain is composed of neurons and other cell types in connected networks that integrate sensory inputs, control movements, facilitate learning and memory, activate and express emotions, and control all other behavioral and cognitive functions. Neurons communicate primarily through electrochemical pulses that transmit signals between connected cells within and between brain areas. Thus, the desire to noninvasively capture and replicate neural activity associated with cognitive states has been a subject of interest to behavioral and cognitive neuroscientists.

Technological advances now allow for non-invasive recording of large quantities of information from the brain at multiple spatial and temporal scales. Examples include electroencephalogram (“EEG”) data using multi-channel electrode arrays placed on the scalp or inside the brain, functional data using functional magnetic resonance imaging (“fMRI”) and magnetoencephalography (“MEG”), and others. Noninvasive neuromodulation technologies have also been developed that can modulate the pattern of neural activity, and thereby cause altered behavior, cognitive states, perception, and motor output. Integration of noninvasive measurement and neuromodulation techniques for identifying and transplanting brain states from neural activity would be very valuable for clinical therapies, such as brain stimulation and related technologies often attempting to treat disorders of cognition. However, to date, no such systems and methods have been developed.

The brain is a key part of the central nervous system, and is enclosed in the skull. In humans, and mammals more generally, the brain controls both autonomic processes, as well as cognitive processes. The brain (and to a lesser extent, the spinal cord) controls all volitional functions of the body and interprets information from the outside world. Intelligence, memory, emotions, speech, thoughts, movements and creativity are controlled by the brain. The central nervous system also controls autonomic functions and many homeostatic and reflex actions, such as breathing, heart rate, etc. The human brain consists of the cerebrum, cerebellum, and brainstem. The brainstem includes the midbrain, the pons, and the medulla oblongata. Sometimes the diencephalon, the caudal part of the forebrain, is included.

The brainstem provides the main motor and sensory innervation to the face and neck via the cranial nerves. Of the twelve pairs of cranial nerves, ten pairs come from the brainstem. This is an extremely important part of the brain, as the nerve connections of the motor and sensory systems from the main part of the brain to the rest of the body pass through the brainstem. This includes the corticospinal tract (motor), the posterior column-medial lemniscus pathway (fine touch, vibration sensation, and proprioception), and the spinothalamic tract (pain, temperature, itch, and crude touch). The brainstem also plays an important role in the regulation of cardiac and respiratory function. It also regulates the central nervous system and is pivotal in maintaining consciousness and regulating the sleep cycle. The brainstem has many basic functions including heart rate, breathing, sleeping, and eating.

The function of the skull is to protect delicate brain tissue from injury. The skull consists of eight fused bones: the frontal, two parietal, two temporal, sphenoid, occipital and ethmoid. The face is formed by 14 paired bones including the maxilla, zygoma, nasal, palatine, lacrimal, inferior nasal conchae, mandible, and vomer. The bony skull is separated from the brain by the dura, a membranous organ, which in turn contains cerebrospinal fluid. The cortical surface of the brain typically is not subject to localized pressure from the skull. The skull therefore imposes a barrier to electrical access to the brain functions, and in a healthy human, breaching the dura to access the brain is highly disfavored. The result is that electrical readings of brain activity are filtered by the dura, the cerebrospinal fluid, the skull, the scalp, skin appendages (e.g., hair), resulting in a loss of potential spatial resolution and amplitude of signals emanating from the brain. While magnetic fields resulting from brain electrical activity are accessible, the spatial resolution using feasible sensors is also limited.

The cerebrum is the largest part of the brain and is composed of right and left hemispheres. It performs higher functions, such as interpreting inputs from the senses, as well as speech, reasoning, emotions, learning, and fine control of movement. The surface of the cerebrum has a folded appearance called the cortex. The human cortex contains about 70% of the nerve cells (neurons) and gives an appearance of gray color (grey matter). Beneath the cortex are long connecting fibers between neurons, called axons, which make up the white matter.

The cerebellum is located behind the cerebrum and brainstem. It coordinates muscle movements, helps to maintain balance and posture. The cerebellum may also be involved in some cognitive functions such as attention and language, as well as in regulating fear and pleasure responses. There is considerable evidence that the cerebellum plays an essential role in some types of motor learning. The tasks where the cerebellum most clearly comes into play are those in which it is necessary to make fine adjustments to the way an action is performed. There is dispute about whether learning takes place within the cerebellum itself, or whether it merely serves to provide signals that promote learning in other brain structures.

The brain communicates with the body through the spinal cord and twelve pairs of cranial nerves. Ten of the twelve pairs of cranial nerves that control hearing, eye movement, facial sensations, taste, swallowing and movement of the face, neck, shoulder and tongue muscles originate in the brainstem. The cranial nerves for smell and vision originate in the cerebrum.

The right and left hemispheres of the brain are joined by a structure consisting of fibers called the corpus callosum. Each hemisphere controls the opposite side of the body. Not all functions of the hemispheres are shared.

The cerebral hemispheres have distinct structures, which divide the brain into lobes. Each hemisphere has four lobes: frontal, temporal, parietal, and occipital. There are very complex relationships between the lobes of the brain and between the right and left hemispheres. There are very complex relationships between the lobes of the brain and between the right and left hemispheres. Frontal lobes control judgment, planning, problem-solving, behavior, emotions, personality, speech, self-awareness, concentration, intelligence, body movements; Temporal lobes control understanding of language, memory, organization and hearing; Parietal lobes control interpretation of language; input from vision, hearing, sensory, and motor; temperature, pain, tactile signals, memory, spatial and visual perception; Occipital lobes interpret visual input (movement, light, color).

A neuron is a fundamental unit of the nervous system, which comprises the autonomic nervous system and the central nervous system.

Brain structures and particular areas within brain structures include but are not limited to Hindbrain structures (e.g., Myelencephalon structures (e.g., Medulla oblongata, Medullary pyramids, Olivary body, Inferior olivary nucleus, Respiratory center, Cuneate nucleus, Gracile nucleus, Intercalated nucleus, Medullary cranial nerve nuclei, Inferior salivatory nucleus, Nucleus ambiguous, Dorsal nucleus of vagus nerve, Hypoglossal nucleus, Solitary nucleus, etc.), Metencephalon structures (e.g., Pons, Pontine cranial nerve nuclei, chief or pontine nucleus of the trigeminal nerve sensory nucleus (V), Motor nucleus for the trigeminal nerve (V), Abducens nucleus (VI), Facial nerve nucleus (VII), vestibulocochlear nuclei (vestibular nuclei and cochlear nuclei) (VIII), Superior salivatory nucleus, Pontine tegmentum, Respiratory centers, Pneumotaxic center, Apneustic center, Pontine micturition center (Barrington's nucleus), Locus coeruleus, Pedunculopontine nucleus, Laterodorsal tegmental nucleus, Tegmental pontine reticular nucleus, Superior olivary complex, Paramedian pontine reticular formation, Cerebellar peduncles, Superior cerebellar pedunde, Middle cerebellar pedunde, Inferior cerebellar pedunde, Fourth ventride, Cerebellum, Cerebellar vermis, Cerebellar hemispheres, Anterior lobe, Posterior lobe, Flocculonodular lobe, Cerebellar nuclei, Fastigial nucleus, Interposed nucleus, Globose nucleus, Emboliform nucleus, Dentate nucleus, etc.)), Midbrain structures (e.g., Tectum, Corpora quadrigemina, inferior colliculi, superior colliculi, Pretectum, Tegmentum, Periaqueductal gray, Parabrachial area, Medial parabrachial nucleus, Lateral parabrachial nucleus, Subparabrachial nucleus (Kolliker-Fuse nucleus), Rostral interstitial nucleus of medial longitudinal fasciculus, Midbrain reticular formation, Dorsal raphe nucleus, Red nucleus, Ventral tegmental area, Substantia nigra, Pars compacta, Pars reticulata, Interpeduncular nucleus, Cerebral pedunde, Cms cerebri, Mesencephalic cranial nerve nuclei, Oculomotor nucleus (III), Trochlear nucleus (IV), Mesencephalic duct (cerebral aqueduct, aqueduct of Sylvius), etc.), Forebrain structures (e.g., Diencephalon, Epithalamus structures (e.g., Pineal body, Habenular nuclei, Stria medullares, Taenia thalami, etc.) Third ventride, Thalamus structures (e.g., Anterior nuclear group, Anteroventral nucleus (aka ventral anterior nucleus), Anterodorsal nucleus, Anteromedial nucleus, Medial nuclear group, Medial dorsal nucleus, Midline nuclear group, Paratenial nucleus, Reuniens nucleus, Rhomboidal nucleus, Intralaminar nuclear group, Centromedial nucleus, Parafascicular nucleus, Paracentral nucleus, Central lateral nucleus, Central medial nucleus, Lateral nuclear group, Lateral dorsal nucleus, Lateral posterior nucleus, Pulvinar, Ventral nuclear group, Ventral anterior nucleus, Ventral lateral nucleus, Ventral posterior nucleus, Ventral posterior lateral nucleus, Ventral posterior medial nucleus, Metathalamus, Medial geniculate body, Lateral geniculate body, Thalamic reticular nucleus, etc.), Hypothalamus structures (e.g., Anterior, Medial area, Parts of preoptic area, Medial preoptic nucleus, Suprachiasmatic nucleus, Paraventricular nucleus, Supraoptic nucleus (mainly), Anterior hypothalamic nucleus, Lateral area, Parts of preoptic area, Lateral preoptic nucleus, Anterior part of Lateral nucleus, Part of supraoptic nucleus, Other nuclei of preoptic area, median preoptic nucleus, periventricular preoptic nucleus, Tuberal, Medial area, Dorsomedial hypothalamic nucleus, Ventromedial nucleus, Arcuate nucleus, Lateral area, Tuberal part of Lateral nucleus, Lateral tuberal nuclei, Posterior, Medial area, Mammillary nuclei (part of mammillary bodies), Posterior nucleus, Lateral area, Posterior part of Lateral nucleus, Optic chiasm, Subfornical organ, Periventricular nucleus, Pituitary stalk, Tuber cinereum, Tuberal nucleus, Tuberomammillary nucleus, Tuberal region, Mammillary bodies, Mammillary nucleus, etc.), Subthalamus structures (e.g., Thalamic nucleus, Zona incerta, etc.), Pituitary gland structures (e.g., neurohypophysis, Pars intermedia (Intermediate Lobe), adenohypophysis, etc.), Telencephalon structures, white matter structures (e.g., Corona radiata, Internal capsule, External capsule, Extreme capsule, Arcuate fasciculus, Uncinate fasciculus, Perforant Path, etc.), Subcortical structures (e.g., Hippocampus (Medial Temporal Lobe), Dentate gyrus, Cornu ammonis (CA fields), Cornu ammonis area 1, Cornu ammonis area 2, Cornu ammonis area 3, Cornu ammonis area 4, Amygdala (limbic system) (limbic lobe), Central nucleus (autonomic nervous system), Medial nucleus (accessory olfactory system), Cortical and basomedial nuclei (main olfactory system), Lateral[disambiguation needed] and basolateral nuclei (frontotemporal cortical system), Claustrum, Basal ganglia, Striatum, Dorsal striatum (aka neostriatum), Putamen, Caudate nucleus, Ventral striatum, Nucleus accumbens, Olfactory tuberde, Globus pallidus (forms nucleus lentiformis with putamen), Subthalamic nucleus, Basal forebrain, Anterior perforated substance, Substantia innominata, Nucleus basalis, Diagonal band of Broca, Medial septal nuclei, etc.), Rhinencephalon structures (e.g., Olfactory bulb, Piriform cortex, Anterior olfactory nucleus, Olfactory tract, Anterior commissure, Uncus, etc.), Cerebral cortex structures (e.g., Frontal lobe, Cortex, Primary motor cortex (Precentral gyrus, M1), Supplementary motor cortex, Premotor cortex, Prefrontal cortex, Gyri, Superior frontal gyrus, Middle frontal gyrus, Inferior frontal gyrus, Brodmann areas: 4, 6, 8, 9, 10, 11, 12, 24, 25, 32, 33, 44, 45, 46, 47, Parietal lobe, Cortex, Primary somatosensory cortex (S1), Secondary somatosensory cortex (S2), Posterior parietal cortex, Gyri, Postcentral gyrus (Primary somesthetic area), Other, Precuneus, Brodmann areas 1, 2, 3 (Primary somesthetic area); 5, 7, 23, 26, 29, 31, 39, 40, Occipital lobe, Cortex, Primary visual cortex (V1), V2, V3, V4, V5MT, Gyri, Lateral occipital gyrus, Cuneus, Brodmann areas 17 (V1, primary visual cortex); 18, 19, Temporal lobe, Cortex, Primary auditory cortex (A1), secondary auditory cortex (A2), Inferior temporal cortex, Posterior inferior temporal cortex, Superior temporal gyrus, Middle temporal gyrus, Inferior temporal gyrus, Entorhinal Cortex, Perirhinal Cortex, Parahippocampal gyrus, Fusiform gyrus, Brodmann areas: 9, 20, 21, 22, 27, 34, 35, 36, 37, 38, 41, 42, Medial superior temporal area (MST), Insular cortex, Cingulate cortex, Anterior cingulate, Posterior cingulate, Retrosplenial cortex, Indusium griseum, Subgenual area 25, Brodmann areas 23, 24; 26, 29, 30 (retrosplenial areas); 31, 32, etc.)).

Neurons—Neurons are electrically excitable cells that receive, process, and transmit information, and based on that information sends a signal to other neurons, muscles, or glands through electrical and chemical signals. These signals between neurons occur via specialized connections called synapses. Neurons can connect to each other to form neural networks. The basic purpose of a neuron is to receive incoming information and, based upon that information send a signal to other neurons, muscles, or glands. Neurons are designed to rapidly send signals across physiologically long distances. They do this using electrical signals called nerve impulses or action potentials. When a nerve impulse reaches the end of a neuron, it triggers the release of a chemical, e.g., neurotransmitter. The neurotransmitter travels rapidly across the short gap between cells (the synapse) and acts to signal the adjacent cell. See www.biologyreference.com/Mo—Nu/Neuron.html#ixzz5AVxCuM5a.

Neurons can receive thousands of inputs from other neurons through synapses. Synaptic integration is a mechanism whereby neurons integrate these inputs before the generation of a nerve impulse, or action potential. The ability of synaptic inputs to effect neuronal output is determined by a number of factors: Size, shape and relative timing of electrical potentials generated by synaptic inputs; the geometric structure of the target neuron; the physical location of synaptic inputs within that structure; and the expression of voltage-gated channels in different regions of the neuronal membrane.

Neurons within a neural network receive information from, and send information to, many other cells, at specialized junctions called synapses. Synaptic integration is the computational process by which an individual neuron processes its synaptic inputs and converts them into an output signal. Synaptic potentials occur when neurotransmitter binds to and opens ligand-operated channels in the dendritic membrane, allowing ions to move into or out of the cell according to their electrochemical gradient. Synaptic potentials can be either excitatory or inhibitory depending on the direction and charge of ion movement. Action potentials occur if the summed synaptic inputs to a neuron reach a threshold level of depolarization and trigger regenerative opening of voltage-gated ion channels. Synaptic potentials are often brief and of small amplitude, therefore summation of inputs in time (temporal summation) or from multiple synaptic inputs (spatial summation) is usually required to reach action potential firing threshold.

There are two types of synapses: electrical synapses and chemical synapses. Electrical synapses are a direct electrical coupling between two cells mediated by gap junctions, which are pores constructed of connexin proteins—essentially result in the passing of a gradient potential (may be depolarizing or hyperpolarizing) between two cells. Electrical synapses are very rapid (no synaptic delay). It is a passive process where signal can degrade with distance and may not produce a large enough depolarization to initiate an action potential in the postsynaptic cell. Electrical synapses are bidirectional, i.e., postsynaptic ell can actually send messages to the presynaptic cell.

Chemical synapses are a coupling between two cells through neuro-transmitters, ligand or voltage gated channels, receptors. They are influenced by the concentration and types of ions on either side of the membrane. Among the neurotransmitters, Glutamate, sodium, potassium, and calcium are positively charged. GABA and chloride are negatively charged. Neurotransmitter junctions provide an opportunity for pharmacological intervention, and many different drugs, including illicit drugs, act at synapses.

An excitatory postsynaptic potential (EPSP) is a postsynaptic potential that makes the postsynaptic neuron more likely to fire an action potential. An electrical charge (hyperpolarization) in the membrane of a postsynaptic neuron is caused by the binding of an inhibitory neurotransmitter from a presynaptic ell to a postsynaptic receptor. It makes it more difficult for a postsynaptic neuron to generate an action potential. An electrical change (depolarization) in the membrane of a postsynaptic neuron occurs, caused by the binding of an excitatory neurotransmitter from a presynaptic ell to a postsynaptic receptor. It makes it more likely for a postsynaptic neuron to generate an action potential. In a neuronal synapse that uses glutamate as receptor, for example, receptors open ion channels that are non-selectively permeable to cations. When these glutamate receptors are activated, both Na+ and K+ flow across the postsynaptic membrane. The reversal potential (Erev) for the post-synaptic current is approximately 0 mV. The resting potential of neurons is approximately −60 mV. The resulting EPSP will depolarize the post synaptic membrane potential, bringing it toward 0 mV.

An inhibitory postsynaptic potential (IPSP) is a kind of synaptic potential that makes a postsynaptic neuron less likely to generate an action potential. An example of inhibitory post synaptic s action is a neuronal synapse that uses gamma-Aminobutyric acid (γ-Aminobutyric acid, or GABA) as its transmitter. At such synapses, the GABA receptors typically open channels that are selectively permeable to Cl—. When these channels open, negatively charged chloride ions can flow across the membrane. The postsynaptic neuron has a resting potential of −60 mV and an action potential threshold of −40 mV. Transmitter release at this synapse will inhibit the postsynaptic cell. Since E_(a) is more negative than the action potential threshold, e.g., −70 mV, it reduces the probability that the postsynaptic ell will fire an action potential.

Some types of neurotransmitters, such as glutamate, consistently result in EPSPs. Others, such as GABA, consistently result in IPSPs. The action potential lasts about one millisecond (1 msec). In contrast, the EPSPs and IPSPs can last as long as 5 to 10 msec. This allows the effect of one postsynaptic potential to build upon the next and so on.

Membrane leakage, and to a lesser extent, potentials per se, can be influenced by external electrical and magnetic fields. These fields may be generated focally, such as through implanted electrodes, or less specifically, such as through transcranial stimulation. Transcranial stimulation may be subthreshold or superthreshold. In the former case, the external stimulation acts to modulate resting membrane potential, making nerves more or less excitable. Such stimulation may be direct current or alternating current. In the latter case, this will tend to synchronize neuron depolarization with the signals. Superthreshold stimulation can be painful (at least because the stimulus directly excites pain neurons) and must be pulsed. Since this has correspondence to electroconvulsive therapy, superthreshold transcranial stimulation is sparingly used.

A number of neurotransmitters are known, as are pharmaceutical interventions and therapies that influence these compounds. Typically, the major neurotransmitters are small monoamine molecules, such as dopamine, epinephrine, norepinephrine, serotonin, GABA, histamine, etc., as well as acetylcholine. In addition, neurotransmitters also include amino acids, gas molecules such as nitric oxide, carbon monoxide, carbon dioxide, and hydrogen sulfide, as well as peptides. The presence, metabolism, and modulation of these molecules may influence learning and memory. Supply of neurotransmitter precursors, control of oxidative and mental stress conditions, and other influences on learning and memory-related brain chemistry, may be employed to facilitate memory, learning, and learning adaption transfer.

The neuropeptides, as well as their respective receptors, are widely distributed throughout the mammalian central nervous system. During learning and memory processes, besides structural synaptic remodeling, changes are observed at molecular and metabolic levels with the alterations in neurotransmitter and neuropeptide synthesis and release. While there is a consensus that brain cholinergic neurotransmission plays a critical role in the processes related to learning and memory, it is also well known that these functions are influenced by a tremendous number of neuropeptides and non-peptide molecules. Arginine vasopressin (AVP), oxytocin, angiotensin II, insulin, growth factors, serotonin (5-HT), melanin-concentrating hormone, histamine, bombesin and gastrin-releasing peptide (GRP), glucagon-like peptide-1 (GLP-1), cholecystokinin (CCK), dopamine, corticotropin-releasing factor (CRF) have modulatory effects on learning and memory. Among these peptides, CCK, 5-HT, and CRF play strategic roles in the modulation of memory processes under stressful conditions. CRF is accepted as the main neuropeptide involved in both physical and emotional stress, with a protective role during stress, possibly through the activation of the hypothalamo-pituitary (HPA) axis. The peptide CCK has been proposed to facilitate memory processing, and CCK-like immunoreactivity in the hypothalamus was observed upon stress exposure, suggesting that CCK may participate in the central control of stress response and stress-induced memory dysfunction. On the other hand, 5-HT appears to play a role in behaviors that involve a high cognitive demand and stress exposure activates serotonergic systems in a variety of brain regions. See: Mehmetali Gülpinar, Berrak C Ye{hacek over (g)}en, “The Physiology of Learning and Memory: Role of Peptides and Stress”, Current Protein and Peptide Science, 2004(5), www.researchgate.net/publication/8147320_The_Physiology_of_Learning_and_Memory_Role_of_Peptides_and_Stress. Deep brain stimulation is described in NIH Research Matters, “A noninvasive deep brain stimulation technique”, (2017), Brainworks, “QEEG Brain Mapping”; Carmon, A., Mor, J., & Goldberg, J. (1976). Evoked cerebral responses to noxious thermal stimuli in humans. Experimental Brain Research, 25(1), 103-107.

Mental State—A mental state is a state of mind that a subject is in. Some mental states are pure and unambiguous, while humans are capable of complex states that are a combination of mental representations, which may have in their pure state contradictory characteristics. There are several paradigmatic states of mind that a subject has: love, hate, pleasure, fear, and pain. Mental states can also include a waking state, a sleeping state, a flow (or being in the “zone”), and a mood (a mental state). A mental state is a hypothetical state that corresponds to thinking and feeling, and consists of a conglomeration of mental representations. A mental state is related to an emotion, though it can also relate to cognitive processes. Because the mental state itself is complex and potentially possess inconsistent attributes, clear interpretation of mental state through external analysis (other than self-reporting) is difficult or impossible. However, a number of studies report that certain attributes of mental state or thought processes may in fact be determined through passive monitoring, such as EEG, with some degree of statistical reliability. In most studies, the characterization of mental state was an endpoint, and the raw signals, after statistically classification or semantic labelling, are superseded and the remaining signal energy treated as noise. Current technology does not permit a precise abstract encoding or characterization of the full range of mental states based on neural correlates of mental state.

Neural Correlates—A neural correlate of a mental state is an electro-neuro-biological state or the state assumed by some biophysical subsystem of the brain, whose presence necessarily and regularly correlates with such specific mental state. All properties credited to the en.wikipedia.org/wiki/Mind, including consciousness, emotion, and desires are thought to have direct neural correlates. For our purposes, neural correlates of a mental state can be defined as the minimal set of neuronal oscillations that correspond to the given mental state. Neuroscientists use empirical approaches to discover neural correlates of subjective mental states.

Brainwaves—At the root of all our thoughts, emotions, and behaviors is the communication between neurons within our brains, a rhythmic or repetitive neural activity in the central nervous system. The oscillation can be produced by a single neuron or by synchronized electrical pulses from ensembles of neurons communicating with each other. The interaction between neurons can give rise to oscillations at a different frequency than the firing frequency of individual neurons. The synchronized activity of large numbers of neurons produces macroscopic oscillations, which can be observed in an electroencephalogram. They are divided into bandwidths to describe their purported functions or functional relationships. Oscillatory activity in the brain is widely observed at different levels of organization and is thought to play a key role in processing neural information. Numerous experimental studies support a functional role of neural oscillations. A unified interpretation, however, is still not determined. Neural oscillations and synchronization have been linked to many cognitive functions such as information transfer, perception, motor control and memory. Electroencephalographic(EEG) signals are relatively easy and safe to acquire, have a long history of analysis, and can have high dimensionality, e.g., up to 128 or 256 separate recording electrodes. While the information represented in each electrode is not independent of the others, and the noise in the signals high, there is much information available through such signals that has not been fully characterized to date.

Brain waves have been widely studied in neural activity generated by large groups of neurons, mostly by EEG. In general, EEG signals reveal oscillatory activity (groups of neurons periodically firing in synchrony), in specific frequency bands: alpha (7.5-12.5 Hz) that can be detected from the occipital lobe during relaxed wakefulness and which increases when the eyes are closed; delta (1-4 Hz), theta (4-8 Hz), beta (13-30 Hz), low gamma (30-70 Hz), and high gamma (70-150 Hz) frequency bands, where faster rhythms such as gamma activity have been linked to cognitive processing. Higher frequencies imply multiple groups of neurons firing in coordination, either in parallel or in series, or both, since individual neurons do not fire at rates of 100 Hz. Neural oscillations of specific characteristics have been linked to cognitive states, such as awareness and consciousness and different sleep stages.

The functional role of neural oscillations is still not fully understood; however, they have been shown to correlate with emotional responses, motor control, and a number of cognitive functions including information transfer, perception, and memory. Specifically, neural oscillations, in particular theta activity, are extensively linked to memory function, and coupling between theta and gamma activity is considered to be vital for memory functions, including episodic memory. Electroencephalography (EEG) has been most widely used in the study of neural activity generated by large groups of neurons, known as neural ensembles, including investigations of the changes that occur in electroencephalographic profiles during cycles of sleep and wakefulness. EEG signals change dramatically during sleep and show a transition from faster frequencies to increasingly slower frequencies, indicating a relationship between the frequency of neural oscillations and cognitive states including awareness and consciousness.

It is a useful analogy to think of brainwaves as musical notes. Like in symphony, the higher and lower frequencies link and cohere with each other through harmonics, especially when one considers that neurons may be coordinated not only based on transitions, but also on phase delay. Oscillatory activity is observed throughout the central nervous system at all levels of organization. The dominant neuro oscillation frequency is associated with a respective mental state.

The functions of brain waves are wide-ranging and vary for different types of oscillatory activity. Neural oscillations also play an important role in many neurological disorders.

In standard EEG recording practice, 19 recording electrodes are placed uniformly on the scalp (the International 10-20 System). In addition, one or two reference electrodes (often placed on earlobes) and a ground electrode (often placed on the nose to provide amplifiers with reference voltages) are required. However, additional electrodes may add minimal useful information unless supplemented by computer algorithms to reduce raw EEG data to a manageable form. When large numbers of electrodes are employed, the potential at each location may be measured with respect to the average of all potentials (the common average reference), which often provides a good estimate of potential at infinity. The common average reference is not appropriate when electrode coverage is sparse (perhaps less than 64 electrodes). See, Paul L. Nunez and Ramesh Srinivasan (2007) Electroencephalogram. Scholarpedia, 2(2):1348, scholarpedia.org/article/Electroencephalogram. Dipole localization algorithms may be useful to determine spatial emission patterns in EEG.

Scalp potential may be expressed as a volume integral of dipole moment per unit volume over the entire brain provided P(r,t) is defined generally rather than in columnar terms. For the important case of dominant cortical sources, scalp potential may be approximated by the following integral over the cortical volume Θ, VS(r,t)=∫∫∫ΘG(r,r′)·P(r′,t)dΘ(r′). If the volume element dΘ(r′) is defined in terms of cortical columns, the volume integral may be reduced to an integral over the folded cortical surface. The time-dependence of scalp potential is the weighted sum of all dipole time variations in the brain, although deep dipole volumes typically make negligible contributions.

The vector Green's function G(r,r′) contains all geometric and conductive information about the head volume conductor and weights the integral accordingly. Thus, each scalar component of the Green's function is essentially an inverse electrical distance between each source component and scalp location. For the idealized case of sources in an infinite medium of constant conductivity, the electrical distance equals the geometric distance. The Green's function accounts for the tissue's finite spatial extent and its inhomogeneity and anisotropy. The forward problem in EEG consists of choosing a head model to provide G(r,r′) and carrying out the integral for some assumed source distribution. The inverse problem consists of using the recorded scalp potential distribution VS(r,t) plus some constraints (usual assumptions) on P(r,t) to find the best fit source distribution P(r,t). Since the inverse problem has no unique solution, any inverse solution depends critically on the chosen constraints, for example, only one or two isolated sources, distributed sources confined to the cortex, or spatial and temporal smoothness criteria.

High-resolution EEG uses the experimental scalp potential VS(r,t) to predict the potential on the dura surface (the unfolded membrane surrounding the cerebral cortex)VD(r,t). This may be accomplished using a head model Green's function G(r,r′) or by estimating the surface Laplacian with either spherical or 3D splines. These two approaches typically provide very similar dura potentials VD(r,t); the estimates of dura potential distribution are unique subject to head model, electrode density, and noise issues.

In an EEG recording system, each electrode is connected to one input of a differential amplifier (one amplifier per pair of electrodes); a common system reference electrode (or synthesized reference) is connected to the other input of each differential amplifier. These amplifiers amplify the voltage between the active electrode and the reference (typically 1,000-100,000 times, or 60-100 dB of voltage gain). The amplified signal is digitized via an analog-to-digital converter, after being passed through an anti-aliasing filter. Analog-to-digital sampling typically occurs at 256-512 Hz in clinical scalp EEG; sampling rates of up to 20 kHz are used in some research applications. The EEG signals can be captured with open source hardware such as OpenBCl, and the signal can be processed by freely available EEG software such as EEGLAB or the Neurophysiological Biomarker Toolbox. A typical adult human EEG signal is about 10 μV to 100 μV in amplitude when measured from the scalp and is about 10-20 mV when measured from subdural electrodes.

Delta wave (en.wikipedia.org/wiki/Delta_wave) is the frequency range up to 4 Hz. It tends to be the highest in amplitude and the slowest waves. It is normally seen in adults in NREM(en.wikipedia.org/wiki/NREM). It is also seen normally in babies. It may occur focally with subcortical lesions and in general distribution with diffuse lesions, metabolic encephalopathy hydrocephalus or deep midline lesions. It is usually most prominent frontally in adults (e.g., FIRDA-frontal intermittent rhythmic delta) and posteriorly in children (e.g., OIRDA-occipital intermittent rhythmic delta).

Theta is the frequency range from 4 Hz to 7 Hz. Theta is normally seen in young children. It may be seen in drowsiness or arousal in older children and adults; it can also be seen in meditation. Excess theta for age represents abnormal activity. It can be seen as a focal disturbance in focal subcortical lesions; it can be seen in generalized distribution in diffuse disorder or metabolic encephalopathy or deep midline disorders or some instances of hydrocephalus. On the contrary, this range has been associated with reports of relaxed, meditative, and creative states.

Alpha is the frequency range from 7 Hz to 14 Hz. This was the “posterior basic rhythm” (also called the “posterior dominant rhythm” or the “posterior alpha rhythm”), seen in the posterior regions of the head on both sides, higher in amplitude on the dominant side. It emerges with the closing of the eyes and with relaxation and attenuates with eye opening or mental exertion. The posterior basic rhythm is actually slower than 8 Hz in young children (therefore technically in the theta range). In addition to the posterior basic rhythm, there are other normal alpha rhythms such as the sensorimotor, or mu rhythm (alpha activity in the contralateral sensory and motor cortical areas) that emerges when the hands and arms are idle; and the “third rhythm” (alpha activity in the temporal or frontal lobes). Alpha can be abnormal; for example, an EEG that has diffuse alpha occurring in coma and is not responsive to external stimuli is referred to as “alpha coma.”

Beta is the frequency range from 15 Hz to about 30 Hz. It is usually seen on both sides in symmetrical distribution and is most evident frontally. Beta activity is closely linked to motor behavior and is generally attenuated during active movements. Low-amplitude beta with multiple and varying frequencies is often associated with active, busy or anxious thinking and active concentration. Rhythmic beta with a dominant set of frequencies is associated with various pathologies, such as Dup15q syndrome, and drug effects, especially benzodiazepines. It may be absent or reduced in areas of cortical damage. It is the dominant rhythm in patients who are alert or anxious or who have their eyes open.

Gamma is the frequency range approximately 30-100 Hz. Gamma rhythms are thought to represent binding of different populations of neurons together into a network to carry out a certain cognitive or motor function.

Mu range is 8-13 Hz and partly overlaps with other frequencies. It reflects the synchronous firing of motor neurons in a rest state. Mu suppression is thought to reflect motor mirror neuron systems, because when an action is observed, the pattern extinguishes, possibly because of the normal neuronal system and the mirror neuron system “go out of sync” and interfere with each other. (en.wikipedia.org/wiki/Electroencephalography). See:

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TABLE 1 Comparison of EEG bands Freq. Band (Hz) Location Normally Pathologically Delta  <4 frontally in adults, posteriorly adult slow-wave sleep subcortical lesions in children; high-amplitude in babies diffuse lesions waves Has been found during some continuous- metabolic encephalopathy hydrocephalus attention tasks deep midline lesions Theta 4-7 Found in locations not related higher in young children focal subcortical lesions to task at hand drowsiness in adults and teens metabolic encephalopathy idling deep midline disorders Associated with inhibition of elicited responses some instances of hydrocephalus (has been found to spike in situations where a person is actively trying to repress a response or action). Alpha  8-15 posterior regions of head, relaxed/reflecting Coma both sides, higher in dosing the eyes amplitude on dominant side. Also associated with inhibition control, Central sites (c3-c4) at rest seemingly with the purpose of timing inhibitory activity in different locations across the brain. Beta 16-31 both sides, symmetrical range span: active calm → intense → Benzodiazepines (en.wikipedia.org/wiki/ distribution, most evident stressed → mild obsessive Benzodiazepines) frontally; low-amplitude active thinking, focus, high alert, anxious Dup15q syndrome waves Gamma >32 Somatosensory cortex Displays during cross-modal sensory processing A decrease in gamma-band activity may be (perception that combines two different senses, associated with cognitive decline, especially such as sound and sight) Also, is shown during when related to the theta band; however, this short-term memory matching of recognized has not been proven for use as a clinical objects, sounds, or tactile sensations diagnostic measurement Mu  8-12 Sensorimotor cortex Shows rest-state motor neurons. Mu suppression could indicate that motor mirror neurons are working. Deficits in Mu suppression, and thus in mirror neurons, might play a role in autism.

EEG AND qEEG—An EEG electrode will mainly detect the neuronal activity in the brain region just beneath it. However, the electrodes receive the activity from thousands of neurons. One square millimeter of cortex surface, for example, has more than 100,000 neurons. It is only when the input to a region is synchronized with electrical activity occurring at the same time that simple periodic waveforms in the EEG become distinguishable. The temporal pattern associated with specific brainwaves can be digitized and encoded a non-transient memory, and embodied in or referenced by, computer software.

EEG (electroencephalography) and MEG (magnetoencephalography) are available technologies to monitor brain electrical activity. Each generally has sufficient temporal resolution to follow dynamic changes in brain electrical activity. Electroencephalography (EEG) and quantitative electroencephalography (gEEG) are electrophysiological monitoring methods that analyze the electrical activity of the brain to measure and display patterns that correspond to cognitive states and/or diagnostic information. It is typically noninvasive, with the electrodes placed on the scalp, although invasive electrodes are also used in some cases. EEG signals may be captured and analyzed by a mobile device, often referred as “brain wearables”. There are a variety of “brain wearables” readily available on the market today. EEGs can be obtained with a non-invasive method where the aggregate oscillations of brain electric potentials are recorded with numerous electrodes attached to the scalp of a person. Most EEG signals originate in the brain's outer layer (the cerebral cortex), believed largely responsible for our thoughts, emotions, and behavior. Cortical synaptic action generates electrical signals that change in the 10 to 100-millisecond range. Transcutaneous EEG signals are limited by the relatively insulating nature of the skull surrounding the brain, the conductivity of the cerebrospinal fluid and brain tissue, relatively low amplitude of individual cellular electrical activity, and distances between the cellular current flows and the electrodes. EEG is characterized by: (1) Voltage; (2) Frequency; (3) Spatial location; (4) Inter-hemispheric symmetries; (5) Reactivity (reaction to state change); (6) Character of waveform occurrence (random, serial, continuous); and (7) Morphology of transient events. EEGs can be separated into two main categories. Spontaneous EEG which occur in the absence of specific sensory stimuli and evoked potentials (EPs) which are associated with sensory stimuli like repeated light flashes, auditory tones, finger pressure or mild electric shocks. The latter is recorded for example by time averaging to remove effects of spontaneous EEG. Non-sensory triggered potentials are also known. EP's typically are time synchronized with the trigger, and thus have an organization principle. Event-related potentials (ERPs) provide evidence of a direct link between cognitive events and brain electrical activity in a wide range of cognitive paradigms. It has generally been held that an ERP is the result of a set of discrete stimulus-evoked brain events. Event-related potentials (ERPs) are recorded in the same way as EPs, but occur at longer latencies from the stimuli and are more associated with an endogenous brain state.

Typically, a magnetic sensor with sufficient sensitivity to individual cell depolarization or small groups is a superconducting quantum interference device (SQIUD), which requires cryogenic temperature operation, either at liquid nitrogen temperatures (high temperature superconductors, HTS) or at liquid helium temperatures (low temperature superconductors, LTS). However, current research shows possible feasibility of room temperature superconductors (20C). Magnetic sensing has an advantage, due to the dipole nature of sources, of having heifer potential volumetric localization; however, due to this added information, complexity of signal analysis is increased.

In general, the electromagnetic signals detected represent action potentials, an automatic response of a nerve cell to depolarization beyond a threshold, which briefly opens conduction channels. The cells have ion pumps which seek to maintain a depolarized state. Once triggered, the action potential propagates along the membrane in two-dimensions, causing a brief high level of depolarizing ion flow. There is a quiescent period after depolarization that generally prevents oscillation within a single cell. Since the exon extends from the body of the neuron, the action potential will typically proceed along the length of the axon, which terminates in a synapse with another cell. While direct electrical connections between cells occur, often the axon releases a neurotransmitter compound into the synapse, which causes a depolarization or hyperpolarization of the target cell. Indeed, the result may also be release of a hormone or peptide, which may have a local or more distant effect.

The electrical fields detectable externally tend to not include signals which low frequency signals, such as static levels of polarization, or cumulative depolarizating or hyperpolarizing effects between action potentials. In myelinated tracts, the current flows at the segments tend to be small, and therefore the signals from individual cells are small. Therefore, the largest signal components are from the synapses and cell bodies. In the cerebrum and cerebellum, these structures are mainly in the cortex, which is largely near the skull, making electroencephalography useful, since it provides spatial discrimination based on electrode location. However, deep signals are attenuated, and poorly localized. Magnetoencephalography detects dipoles, which derive from current flow, rather than voltage changes. In the case of a radially or spherically symmetric urrent flow within a short distance, the dipoles will tend to cancel, while net current flows long axons will reinforce. Therefore, an electroencephalogram reads a different signal than a magnetoencephalogram.

EEG-based studies of emotional specificity at the single-electrode level demonstrated that asymmetric activity at the frontal site, especially in the alpha (8-12 Hz) band, is associated with emotion. Voluntary facial expressions of smiles of enjoyment produce higher left frontal activation. Decreased left frontal activity is observed during the voluntary facial expressions of fear. In addition to alpha band activity, theta band power at the frontal midline (Fm) has also been found to relate to emotional states. Pleasant (as opposed to unpleasant) emotions are associated with an increase in frontal midline theta power. Many studies have sought to utilize pattern classification, such as neural networks, statistical classifiers, clustering algorithms, etc., to differentiate between various emotional states reflected in EEG.

EEG-based studies of emotional specificity at the single-electrode level demonstrated that asymmetric activity at the frontal site, especially in the alpha (8-12 Hz) band, is associated with emotion. Ekman and Davidson found that voluntary facial expressions of smiles of enjoyment produced higher left frontal activation (Ekman P, Davidson R J (1993) Voluntary Smiling Changes Regional Brain Activity. Psycho) Sci 4: 342-345). Another study by Coan et al. found decreased left frontal activity during the voluntary facial expressions of fear (Coen J A, Allen J J, Harmon-Jones E (2001) Voluntary facial expression and hemispheric asymmetry over the frontal cortex. Psychophysiology 38: 912-925). In addition to alpha band activity, theta band power at the frontal midline (Fm) has also been found to relate to emotional states. Sammler and colleagues, for example, showed that pleasant (as opposed to unpleasant) emotion is associated with an increase in frontal midline theta power (Sammler D, Grigutsch M, Fritz T, Koelsch S (2007) Music and emotion: Electrophysiological correlates of the processing of pleasant and unpleasant music. Psychophysiology 44: 293-304). To further demonstrate whether these emotion-specific EEG characteristics are strong enough to differentiate between various emotional states, some studies have utilized a pattern classification analysis approach. See, for example:

-   Dan N, Xiao-Wei W, Li-Chen S, Bao-Liang L. EEG-based emotion     recognition during watching movies; 2011-04-27 2011-05-01.2011:     667-670; -   Lin Y P, Wang C H, Jung T P, Wu T L, Jeng S K, (2010) EEG-Based     Emotion Recognition in Music Listening. IEEE T Bio Med Eng     57:1798-1806; -   Murugappan M, Nagarajan R, Yaacob S (2010) Classification of human     emotion from EEG using discrete wavelet transform. J Biomed Sci Eng     3: 390-396; -   Murugappan M, Nagarajan R, Yaacob S (2011) Combining Spatial     Filtering and Wavelet Transform for Classifying Human Emotions Using     EEG Signals. J Med. Bio. Eng. 31: 45-51.

Detecting different emotional states by EEG may be more appropriate using EEG-based functional connectivity. There are various ways to estimate EEG-based functional brain connectivity: correlation, coherence and phase synchronization indices between each pair of EEG electrodes had been used. (Brazier Mass., Casby J U (1952) Cross-correlation and autocorrelation studies of electroencephalographic potentials. Electroen clin neuro 4: 201-211). Coherence gives information similar to correlation, but also includes the covariation between two signals as a function of frequency. (Cantero J L, Atienza M, Salas R M, Gomez C M (1999) Alpha EEG coherence in different brain states: an electrophysiological index of the arousal level in human subjects. Neurosci lett 271: 167-70.) The assumption is that higher correlation indicates a stronger relationship between two signals. (Guevara M A, Corsi-Cabrera M (1996) EEG coherence or EEG correlation? Intl Psychophysiology 23: 145-153; Cantero J L, Atienza M, Salas R M, Gomez C M (1999) Alpha EEG coherence in different brain states: an electrophysiological index of the arousal level in human subjects. Neurosci lett 271: 167-70; Adler G, Brassen 5, Jajcevic A (2003) EEG coherence in Alzheimer's dementia. J Neural Transm 110: 1051-1058; Deeny S P, Hillman C H, Janelle C M, Hatfield B D (2003) Cortico-cortical communication and superior performance in skilled marksmen: An EEG coherence analysis. J Sport Exercise Psy 25: 188-204.) Phase synchronization among the neuronal groups estimated based on the phase difference between two signals is another way to estimate the EEG-based functional connectivity among brain areas. It is. (Franaszauk P J, Bergey G K (1999) An autoregressive method for the measurement of synchronization of interictal and ictal EEG signals. Biol Cybern 81:3-9.)

A number of groups have examined emotional specificity using EEG-based functional brain connectivity. For example, Shin and Park showed that, when emotional states become more negative at high room temperatures, correlation coefficients between the channels in temporal and occipital sites increase (Shin J-H, Park D-H. (2011) Analysis for Characteristics of Electroencephalogram (EEG) and Influence of Environmental Factors According to Emotional Changes. In Lee G, Howard D, Ślęzak D, editors. Convergence and Hybrid Information Technology. Springer Berlin Heidelberg, 488-500.) Hinrichs and Machleidt demonstrated that coherence decreases in the alpha band during sadness, compared to happiness (Hinrichs H, Machleidt W (1992) Basic emotions reflected in EEG-coherences. Intl Psychophysiol 13: 225-232). Miskovic and Schmidt found that EEG coherence between the prefrontal cortex and the posterior cortex increased while viewing highly emotionally arousing (i.e., threatening) images, compared to viewing neutral images (Miskovic V, Schmidt L A (2010) Cross-regional cortical synchronization during affective image viewing. Brain Res 1362: 102-111). Costa and colleagues applied the synchronization index to detect interaction in different brain sites under different emotional states (Costa T, Rognoni E, Galati D (2006) EEG phase synchronization during emotional response to positive and negative film stimuli. Neurosci Left 406: 159-164). Costa's results showed an overall increase in the synchronization index among frontal channels during emotional stimulation, particularly during negative emotion (i.e., sadness). Furthermore, phase synchronization patterns were found to differ between positive and negative emotions. Costa also found that sadness was more synchronized than happiness at each frequency band and was associated with a wider synchronization both between the right and left frontal sites and within the left hemisphere. In contrast, happiness was associated with a wider synchronization between the frontal and occipital sites.

Different connectivity indices are sensitive to different characteristics of EEG signals. Correlation is sensitive to phase and polarity, but is independent of amplitudes. Changes in both amplitude and phase lead to a change in coherence (Guevara M A, Corsi-Cabrera M (1996) EEG coherence or EEG correlation? Intl Psychophysiol 23: 145-153). The phase synchronization index is only sensitive to a change in phase (Lachaux J P, Rodriguez E, Martinerie J, Varela F I (1999) Measuring phase synchrony in brain signals. Hum Brain Mapp 8: 194-208).

A number of studies have tried to classify emotional states by means of recording and statistically analyzing EEG signals from the central nervous systems. See for example:

-   Lin Y P, Wang C H, Jung T P, Wu T L, Jeng S K, et al. (2010)     EEG-Based Emotion Recognition in Music Listening. IEEE T Bio Med Eng     57: 1798-1806 [PubMed]. -   Murugappan M, Nagaraian R, Yaacob S (2010) Classification of human     emotion from EEG using discrete wavelet transform. J Biomed Sci Eng     3: 390-396. -   Murugappan M, Nagaraian R, Yaacob S (2011) Combining Spatial     Filtering and Wavelet Transform for Classifying Human Emotions Using     EEG Signals. J Med. Bio. Eng. 31: 45-51. -   Berkman E, Wong D K, Guimaraes M P, Uy E T, Gross J J, et al. (2004)     Brain wave recognition of emotions in EEG. Psychophysiology 41:     S71-S71. -   Chanel G, Kronegg J, Grandiean D, Pun T (2006) Emotion assessment:     Arousal evaluation using EEG's and peripheral physiological signals.     Multimedia Content Representation, Classification and Security 4105:     530-537. -   Hagiwara KIaM (2003) A Feeling Estimation System Using a Simple     Electroencephalograph. IEEE International Conference on Systems, Man     and Cybernetics. 4204-4209. -   You-Yun Lee and Shulan Hsieh studied different emotional states by     means of EEG-based functional connectivity patterns. They used     emotional film dips to elicit three different emotional states.

The dimensional theory of emotion, which asserts that there are neutral, positive, and negative emotional states, may be used to classify emotional states, because numerous studies have suggested that the responses of the central nervous system correlate with emotional valence and arousal. (See for example, Davidson R J (1993) Cerebral Asymmetry and Emotion—Conceptual and Methodological Conundrums. Cognition Emotion 7: 115-138; Jones N A, Fox N A (1992) Electroencephalogram asymmetry during emotionally evocative films and its relation to positive and negative affectivity. Brain Cogn 20: 280-299 [PubMed]; Schmidt L A, Trainor L J (2001) Frontal brain electrical activity (EEG) distinguishes valence and intensity of musical emotions. Cognition Emotion 15: 487-500; Tomarken A J, Davidson R J, Henriques J B (1990) Resting frontal brain asymmetry predicts affective responses to films. J Pers Soc Psychol 59: 791-801.) As suggested by Mauss and Robins (2009), “measures of emotional responding appear to be structured along dimensions (e.g., valence, arousal) rather than discrete emotional states (e.g., sadness, fear, anger)”.

EEG-based functional connectivity change was found to be significantly different among emotional states of neutral, positive, or negative. Lee Y-Y, Hsieh S (2014) Classifying Different Emotional States by Means of EEG-Based Functional Connectivity Patterns. PLoS ONE 9(4): e95415. doi.org/10.1371/journal.pone.0095415. A connectivity pattern may be detected by pattern classification analysis using Quadratic Discriminate Analysis. The results indicated that the classification rate was better than chance. They concluded that estimating EEG-based functional connectivity provides a useful tool for studying the relationship between brain activity and emotional states.

Emotions affects learning. Intelligent Tutoring Systems (ITS) learner model initially composed of a cognitive module was extended to include a psychological module and an emotional module. Alicia Heraz et al. introduced an emomental agent. It interacts with an ITS to communicate the emotional state of the learner based upon his mental state. The mental state was obtained from the learner's brainwaves. The agent learns to predict the learner's emotions by using machine learning techniques. (Alicia Heraz, Ryad Razaki; Claude Frasson, “Using machine learning to predict learner emotional state from brainwaves” Advanced Learning Technologies, 2007. ICALT 2007. Seventh IEEE International Conference on Advanced Learning Technologies (ICALT 2007)) See also:

-   Ella T. Mampusti, Jose S. Ng, Jarren James I. Quinto, Grizelda L.     Teng, Merlin Teodosia C. Suarez, Rhia S. Trogo, “Measuring Academic     Affective States of Students via Brainwave Signals”, Knowedge and     Systems Engineering (KSE)2011 Third International Conference on, pp.     226-231, 2011 -   Judith J. Azcarraga, John Francis I banez Jr., lanne Robert Lim,     Nestor Lumanas Jr., “Use of Personality Profile in Predicting     Academic Emotion Based on Brainwaves Signals and Mouse Behavior”,     Knowedge and Systems Engineering (KSE)2011 Third International     Conference on, pp. 239-244, 2011. -   Yi-Hung Liu, Chien-Te Wu, Yung-Hwa Kao, Ya-Ting Chen, “Single-trial     EEG-based emotion recognition using kernel Eigen-emotion pattern and     adaptive support vector machine”, Engineering in Medicine and     Biology Society(EMBC)2013 35th Annual International Conference of     the IEEE, pp. 4306-4309, 2013, ISSN 1557-170X. -   Thong Tri Vo, Nam Phuong Nguyen, Toi Vo Van, IFMBE Proceedings, vol.     63, pp. 621, 2018, ISSN 1680-0737, ISBN 978-981-10-4360-4. -   Adrian Rodriguez Aguiñaga, Miguel Angel Lopez Ramirez, Lecture Notes     in Computer Science, vol. 9456, pp. 177, 2015, ISSN 0302-9743, ISBN     978-3-319-26507-0. -   Judith Azcarraga, Merlin Teodosia Suarez, “Recognizing Student     Emotions using Brainwaves and Mouse Behavior Data”, International     Journal of Distance Education Technologies, vol. 11, pp. 1, 2013,     ISSN 1539-3100. -   Tri Thong Vo, Phuong Nam Nguyen, Van Toi Vo, IFMBE Proceedings, vol.     61, pp. 67, 2017, ISSN 1680-0737, ISBN 978-981-10-4219-5. -   Alicia Heraz, Claude Frasson, Lecture Notes in Computer Science,     vol. 5535, pp. 367, 2009, ISSN 0302-9743, ISBN 978-3-642-02246-3. -   Hamwira Yaacob, Wahab Abdul, Norhaslinda Kamaruddin, “Classification     of EEG signals using MLP based on categorical and dimensional     perceptions of emotions”, Information and Communication Technology     for the Muslim World (ICT4M)2013 5th International Conference on,     pp. 1-6, 2013. -   Yuan-Pin Lin, Chi-Hong Wang, Tzyy-Ping Jung, Tien-Lin Wu, Shyh-Kang     Jeng, Jeng-Ren Duann, Jyh-Horng Chen, “EEG-Based Emotion Recognition     in Music Listening”, Biomedical Engineering IEEE Transactions on,     vol. 57, pp. 1798-1806, 2010, ISSN 0018-9294. -   Yi-Hung Liu, Wei-Teng Cheng, Yu-Tsung Hsiao, Chien-Te Wu, Mu-Der     Jeng, “EEG-based emotion recognition based on kernel Fisher's     discriminant analysis and spectral powers”, Systems Man and     Cybernetics (SMC)2014 IEEE International Conference an, pp.     2221-2225, 2014.

Using EEG to assess the emotional state has numerous practical applications. One of the first such applications was the development of a travel guide based on emotions by measuring brainwaves by the Singapore tourism group. “By studying the brainwaves of a family on vacation, the researchers drew up the Singapore Emotion Travel Guide, which advises future visitors of the emotions they can expect to experience at different attractions.” (www.lonelyplanet.com/news/2017/04/12singapore-emotion-travel-guide) Joel Pearson at University of New South Wales and his group developed the protocol of measuring brainwaves of travelers using EEG and decoding specific emotional states.

Another recently released application pertains to virtual reality (VR)technology. On Sep. 18, 2017 Looxid Labs launched a technology that harnesses EEG from a subject wearing a VR headset. Looxid Labs intention is to factor in brain waves into VR applications in order to accurately infer emotions. Other products such as MindMaze and even Samsung have tried creating similar applications through facial muscles recognition. (scoffamyx.com/2017/10/13/looxid-labs-vr-brain-waves-human-emotions/). According to its website (looxidlabs.com/device-2/), the Looxid Labs Development Kit provides a VR headset embedded with miniaturized eye and brain sensors. It uses 6 EEG channels: Fp1, Fp2, AF7, AF8, AF3, AF4 in international 10-20 system.

To assess a user's state of mind, a computer may be used to analyze the EEG signals. However, the emotional states of a brain are complex, and the brain waves associated with specific emotions seem to change over time. Wei-Long Zheng at Shanghai Jiao Tong University used machine learning to identify the emotional brain states and to repeat it reliably. The machine learning algorithm found a set of patterns that clearly distinguished positive, negative, and neutral emotions that worked for different subjects and for the same subjects over time with an accuracy of about 80 percent. (See Wei-Long Zheng, Jia-Yi Zhu, Bao-Liang Lu, Identifying Stable Patterns over Time for Emotion Recognition from EEG, arxiv.org/abs/1601.02197; see also How One Intelligent Machine Learned to Recognize Human Emotions, MIT Technology Review, Jan. 23, 2016.)

MEG—Magnetoencephalography (MEG) is a functional neuroimaging technique for mapping brain activity by recording magnetic fields produced by electrical currents occurring naturally in the brain, using very sensitive magnetometers. Arrays of SQUIDs (superconducting quantum interference devices) are currently the most common magnetometer, while the SERF (spin exchange relaxation-free) magnetometer is being investigated (Hämäläinen, Matti; Hari, Riitta; Ilmoniemi, Risto J.; Knuutila, Jukka; Lounasmaa, Olli V. (1993). “Magnetoencephalography-theory, instrumentation, and applications to noninvasive studies of the working human brain”. Reviews of Modern Physics. 65(2): 413-497. ISSN 0034-6861. doi:10.1103/RevModPhys.65.413.) It is known that “neuronal activity causes local changes in cerebral blood flow, blood volume, and blood oxygenation” (Dynamic magnetic resonance imaging of human brain activity during primary sensory stimulation. K. K. Kwong, J. W. Belliveau, D. A. Chesler, I. E. Goldberg, R. M. Weisskoff, B. P. Poncelet, D. N. Kennedy, B. E. Hoppel, M. S. Cohen, and R. Turner). Using “a 122-channel D.C. SQUID magnetometer with a helmet-shaped detector array covering the subject's head” it has been shown that the “system allows simultaneous recording of magnetic activity all over the head.” (122-channel squid instrument for investigating the magnetic signals from the human brain.) A. I. Ahonen, M. S. Hämäläinen, M. J. Kajola, J. E. T. Knuutila, P. P. Laine, O. V. Lounasmaa, L. T. Parkkonen, J. T. Simola, and C. D. Tesche Physical Scripta, Volume 1993, T49A).

In some cases, magnetic fields cancel, and thus the detectable electrical activity may fundamentally differ from the detectable electrical activity obtained via EEG. However, the main types of brain rhythms are detectable by both methods.

See: U.S. Patent and Pub. App. Nos. U.S. Pat. Nos. 5,059,814; 5,118,606; 5,136,687; 5,224,203; 5,303,705; 5,325,862; 5,461,699; 5,522,863; 5,640,493; 5,715,821; 5,719,561; 5,722,418; 5,730,146; 5,736,543; 5,737,485; 5,747,492; 5,791,342; 5,816,247; 6,497,658; 6,510,340; 6,654,729; 6,893,407; 6,950,697; 8,135,957; 8,620,206; 8,644,754; 9,118,775; 9,179,875; 9,642,552; 20030018278; 20030171689; 20060293578; 20070156457; 20070259323; 20080015458; 20080154148; 20080229408; 20100010365; 20100076334; 20100090835; 20120046531; 20120052905; 20130041281; 20150081299; 20150262016. See EP1304073A2; EP1304073A3; WO2000025668A1; and WO2001087153A1.

MEGs seek to detect the magnetic dipole emission from an electrical discharge in cells, e.g., neural action potentials. Typical sensors for MEGs are superconducting quantum interference devices (SQUIDs). These currently require cooling to liquid nitrogen or liquid helium temperatures. However, the development of room temperature, or near room temperature superconductors, and miniature cryocoolers, may permit field deployments and portable or mobile detectors. Because MEGs are less influenced by medium conductivity and dielectric properties, and because they inherently detect the magnetic field vector, MEG technology permits volumetric mapping of brain activity and distinction of complementary activity that might suppress detectable EEG signals. MEG technology also supports vector mapping of fields, since magnetic emitters are inherently dipoles, and therefore a larger amount of information is inherently available.

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EEGs and MEGs can monitor the state of consciousness. For example, states of deep sleep are associated with slower EEG oscillations of larger amplitude. Various signal analysis methods allow for robust identifications of distinct sleep stages, depth of anesthesia, epileptic seizures and connections to detailed cognitive events.

Positron Emission Tomography (PET) Scan—A PET scan is an imaging test that helps reveal how tissues and organs are functioning (Bailey, D. L; D. W Townsend; P. E. Valk; M N. Mairey (2005) Positron Emission Tomography: Basic Sciences. Secaucus, N.J.: Springer-Verlag. ISBN 1-85233-798-2). A PET scan uses a radioactive drug (positron-emitting tracer) to show this activity. It uses this radiation to produce 3-D, images colored for the different activity of the brain. See, e.g.: Jarden, Jens O, Vijay Dhawan, Alexander Poltorak, Jerome B. Posner, and David A. Rottenberg. “Positron emission tomographic measurement of blood-to-brain and blood-to-tumor transport of 82Rb: The effect of dexamethasone and whole-brain radiation therapy.” Annals of neurology 18, no. 6 (1985): 636-646.

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Functional Magnetic Resonance Imaging fMRI (fMRI)—fMRI is a functional neuroimaging procedure using MRI technology that measures brain activity by detecting changes associated with blood flow (“Magnetic Resonance, a critical peer-reviewed introduction; functional MRI”. European Magnetic Resonance Forum. Retrieved 17 Nov. 2014; Huettel, Song & McCarthy (2009)).

Yukiyasu Kamitani et al., Neuron (DOI: 10.1016/j.neuron.2008.11.004) used an image of brain activity taken in a functional MRI scanner to recreate a black-and-white image from scratch. See also ‘Mind-reading’ software could record your dreams” By Celeste Biever. New Scientist, 12 Dec. 2008. (www.newsdentist.com/article/dn16267-mind-reading-software-could-record-your-dreams/)

See, U.S. Patent and Pub. App. Nos. U.S. Pat. Nos. 6,622,036; 7,120,486; 7,177,675; 7,209,788; 7,489,964; 7,697,979; 7,754,190; 7,856,264; 7,873,411; 7,962,204; 8,060,181; 8,224,433; 8,315,962; 8,320,649; 8,326,433; 8,356,004; 8,380,314; 8,386,312; 8,392,253; 8,532,756; 8,562,951; 8,626,264; 8,632,750; 8,655,817; 8,679,009; 8,684,742; 8,684,926; 8,698,639; 8,706,241; 8,725,669; 8,831,731; 8,849,632; 8,855,773; 8,868,174; 8,915,871; 8,918,162; 8,939,903; 8,951,189; 8,951,192; 9,026,217; 9,037,224; 9,042,201; 9,050,470; 9,072,905; 9,084,896; 9,095,266; 9,101,276; 9,101,279; 9,135,221; 9,161,715; 9,192,300; 9,230,065; 9,248,286; 9,248,288; 9,265,458; 9,265,974; 9,292,471; 9,296,382; 9,302,110; 9,308,372; 9,345,412; 9,367,131; 9,420,970; 9,440,646; 9,451,899; 9,454,646; 9,463,327; 9,468,541; 9,474,481; 9,475,502; 9,489,854; 9,505,402; 9,538,948; 9,579,247; 9,579,457; 9,615,746; 9,693,724; 9,693,734; 9,694,155; 9,713,433; 9,713,444; 20030093129; 20030135128; 20040059241; 20050131311; 20050240253; 20060015034; 20060074822; 20060129324; 20060161218; 20060167564; 20060189899; 20060241718; 20070179534; 20070244387; 20080009772; 20080091118; 20080125669; 20080228239; 20090006001; 20090009284; 20090030930; 20090062676; 20090062679; 20090082829; 20090132275; 20090137923; 20090157662; 20090164132; 20090209845; 20090216091; 20090220429; 20090270754; 20090287271; 20090287272; 20090287273; 20090287467; 20090290767; 20090292713; 20090297000; 20090312808; 20090312817; 20090312998; 20090318773; 20090326604; 20090327068; 20100036233; 20100049276; 20100076274; 20100094154; 20100143256; 20100145215; 20100191124; 20100298735; 20110004412; 20110028827; 20110034821; 20110092882; 20110106750; 20110119212; 20110256520; 20110306845; 20110306846; 20110313268; 20110313487; 20120035428; 20120035765; 20120052469; 20120060851; 20120083668; 20120108909; 20120165696; 20120203725; 20120212353; 20120226185; 20120253219; 20120265267; 20120271376; 20120296569; 20130031038; 20130063550; 20130080127; 20130085678; 20130130799; 20130131755; 20130158883; 20130185145; 20130218053; 20130226261; 20130226408; 20130245886; 20130253363; 20130338803; 20140058528; 20140114889; 20140135642; 20140142654; 20140154650; 20140163328; 20140163409; 20140171757; 20140200414; 20140200432; 20140211593; 20140214335; 20140243652; 20140276549; 20140279746; 20140309881; 20140315169; 20140347265; 20140371984; 20150024356; 20150029087; 20150033245; 20150033258; 20150033259; 20150033262; 20150033266; 20150038812; 20150080753; 20150094962; 20150112899; 20150119658; 20150164431; 20150174362; 20150174418; 20150196800; 20150227702; 20150248470; 20150257700; 20150290453; 20150290454; 20150297893; 20150305685; 20150324692; 20150327813; 20150339363; 20150343242; 20150351655; 20150359431; 20150360039; 20150366482; 20160015307; 20160027342; 20160031479; 20160038049; 20160048659; 20160051161; 20160051162; 20160055304; 20160107653; 20160120437; 20160144175; 20160152233; 20160158553; 20160206380; 20160213276; 20160262680; 20160263318; 20160302711; 20160306942; 20160324457; 20160357256; 20160366462; 20170027812; 20170031440; 20170032098; 20170042474; 20170043160; 20170043167; 20170061034; 20170065349; 20170085547; 20170086727; 20170087302; 20170091418; 20170113046; 20170188876; 20170196501; 20170202476; 20170202518; and 20170206913.

Functional near infrared spectroscopy (fNIRS)—fNIR is a non-invasive imaging method involving the quantification of chromophore concentration resolved from the measurement of near infrared (NIR)light affenuation or temporal or phasic changes. NIR spectrum light takes advantage of the optical window in which skin, tissue, and bone are mostly transparent to NIR light in the spectrum of 700-900 nm, while hemoglobin (Hb) and deoxygenated-hemoglobin (deoxy-Hb) are stronger absorbers of light. Differences in the absorption spectra of deoxy-Hb and oxy-Hb allow the measurement of relative changes in hemoglobin concentration through the use of light affenuation at multiple wavelengths. Two or more wavelengths are selected, with one wavelength above and one below the isosbestic point of 810 nm at which deoxy-Hb and oxy-Hb have identical absorption coefficients. Using the modified Beer-Lambert law (mBLL), relative concentration can be calculated as a function of total photon path length. Typically, the light emitter and detector are placed ipsilaterally on the subject's skull so recorded measurements are due to back-scattered (reflected) light following elliptical pathways. The use of fNIR as a functional imaging method relies on the principle of neuro-vascular coupling also known as the haemodynamic response or blood-oxygen-level dependent (BOLD) response. This principle also forms the core of fMRI techniques. Through neuro-vascular coupling, neuronal activity is linked to related changes in localized cerebral blood flow. fNIR and fMRI are sensitive to similar physiologic changes and are often comparative methods. Studies relating fMRI and fNIR show highly correlated results in cognitive tasks. fNIR has several advantages in cost and portability over fMRI, but cannot be used to measure cortical activity more than 4 cm deep due to limitations in light emitter power and has more limited spatial resolution. fNIR includes the use of diffuse optical tomography (DOT/NIRDOT) for functional purposes. Multiplexing fNIRS channels can allow 2D topographic functional maps of brain activity (e.g. with Hitachi ETG-4000 or Artinis Oxymon) while using multiple emitter spacings may be used to build 3D tomographic maps. Note that fNIR is generally not capable of directly detecting neuron discharge, and therefore the technique is useful for determining metabolic activity level in different areas of the brain.

Beste Yuksel and Robert Jacob, Brain Automated Chorales (BACh), ACM CHI 2016, DOI: 10.1145/2858036.2858388, provides a system that helps beginners learn to play Bach chorales on plano by measuring how hard their brains are working. This is accomplished by estimating the brain's workload using functional Near-Infrared Spectroscopy (fNIRS), a technique that measures oxygen levels in the brain—in this case in the prefrontal cortex. A brain that's working hard pulls in more oxygen. Sensors strapped to the player's forehead talk to a computer, which delivers the new music, one line at a time. See also “Mind-reading tech helps beginners quickly learn to play Bach.” By Anna Nowogrodzki, New Scientist, 9 Feb. 2016 available online at www.newscientist.com/article/2076899-mind-reading-tech-helps-beginners-quickly-learn-to-play-bach/.

LORETA—Low-resolution brain electromagnetictomography often referred as LORETA is a functional imaging technology usually using a linearly constrained minimum variance vector beamformer in the time-frequency domain as described in Gross et al., “Dynamic imaging of coherent sources: Studying neural interactions in the human brain”, PNAS 98, 694-699, 2001. It allows to the image (mostly 3D) evoked and induced oscillatory activity in a variable time-frequency range, where time is taken relative to a triggered event. There are three categories of imaging related to the technique used for LORETA. See, wiki.besa.deindex.php?title=Source_Analysis_3D_Imaging#Multiple_Source_Beamformer_28MSBF.29. The Multiple Source Beamformer (MSBF) is a tool for imaging brain activity. It is applied in the time-frequency domain and based on single-trial data. Therefore, it can image not only evoked, but also induced activity, which is not visible in time-domain averages of the data. Dynamic Imaging of Coherent Sources (DICS) can find coherence between any two pairs of voxels in the brain or between an external source and brain voxels. DICS requires time-frequency-transformed data and can find coherence for evoked and induced activity. The following imaging methods provides an image of brain activity based on a distributed multiple source model: CLARA is an iterative application of LORETA images, focusing the obtained 3D image in each iteration step. LAURA uses a spatial weighting function that has the form of a local autoregressive function. LORETA has the 3D Laplacian operator implemented as spatial weighting prior. sLORETA is an unweighted minimum norm that is standardized by the resolution matrix. swLORETA is equivalent to sLORETA, except for an additional depth weighting. SSLOFO is an iterative application of standardized minimum norm images with consecutive shrinkage of the source space. A User-defined volume image allows experimenting with the different imaging techniques. It is possible to specify user-defined parameters for the family of distributed source images to create a new imaging technique. If no individual MRI is available, the minimum norm image is displayed on a standard brain surface and computed for standard source locations. If available, an individual brain surface is used to construct the distributed source model and to image the brain activity. Unlike classical LORETA, cortical LORETA is not computed in a 3D volume, but on the cortical surface. Unlike classical CLARA, cortical CLARA is not computed in a 3D volume, but on the cortical surface. The Multiple Source Probe Scan (MSPS) is a tool for the validation of a discrete multiple source model. The Source Sensitivity image displays the sensitivity of a selected source in the current discrete source model and is, therefore, data independent.

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Neurofeedback—Neurofeedback (NFB), also called neurotherapy or neurobiofeedback, is a type of biofeedback that uses real-time displays of brain activity-most commonly electroencephalography (EEG), to teach self-regulation of brain function. Typically, sensors are placed on the scalp to measure activity, with measurements displayed using video displays or sound. The feedback may be in various other forms as well. Typically, the feedback is sought to be presented through primary sensory inputs, but this is not a limitation on the technique.

The applications of neurofeedback to enhance performance extend to the arts in fields such as music, dance, and acting. A study with conservatory musicians found that alpha-theta training benefitted the three music domains of musicality, communication, and technique. Historically, alpha-theta training, a form of neurofeedback, was created to assist creativity by inducing hypnagogia, a “borderline waking state associated with creative insights”, through facilitation of neural connectivity. Alpha-theta training has also been shown to improve novice singing in children. Alpha-theta neurofeedback, in conjunction with heart rate variability training, a form of biofeedback, has also produced benefits in dance by enhancing performance in competitive ballroom dancing and increasing cognitive creativity in contemporary dancers. Additionally, neurofeedback has also been shown to instill a superior flow state in actors, possibly due to greater immersion while performing.

Several studies of brain wave activity in experts while performing a task related to their respective area of expertise revealed certain characteristic telltale signs of so-called “flow” associated with top-flight performance. Mihaly Csikszentmihalyi (University of Chicago) found that the most skilled chess players showed less EEG activity in the prefrontal cortex, which is typically associated with higher cognitive processes such as working memory and verbalization, during a game.

Chris Berka et al., Advanced Brain Monitoring, Carlsbad, Calif., The International J. Sport and Society, vol 1, p 87, looked at the brain waves of Olympic archers and professional golfers. A few seconds before the archers fired off an arrow or the golfers hit the ball, the team spotted a small increase in alpha band patterns. This may correspond to the contingent negative variation observed in evoked potential studies, and the Bereitschaftspotential or BP (from German, “readiness potential”), also called the pre-motor potential or readiness potential (RP), a measure of activity in the motor cortex and supplementary motor area of the brain leading up to voluntary muscle movement. Berka also trained novice marksmen using neurofeedback. Each person was hooked up to electrodes that tease out and display specific brain waves, along with a monitor that measured their heartbeat. By controlling their breathing and learning to deliberately manipulate the waveforms on the screen in front of them, the novices managed to produce the alpha waves characteristic of the flow state. This, in turn, helped them improve their accuracy at hitting the targets.

Low Energy Neurofeedback System (LENS)—The LENS, or Low Energy Neurofeedback System, uses a very low power electromagnetic field, to carry feedback to the person receiving it. The feedback travels down the same wires carrying the brain waves to the amplifier and computer. Although the feedback signal is weak, it produces a measurable change in the brainwaves without conscious effort from the individual receiving the feedback. The system is software controlled, to receive input from EEG electrodes, to control the stimulation. Through the scalp. Neurofeedback uses a feedback frequency that is different from, but correlates with, the dominant brainwave frequency. When exposed to this feedback frequency, the EEG amplitude distribution changes in power. Most of the time the brain waves reduce in power; but at times they also increase in power. In either case the result is a changed brainwave state, and much greater ability for the brain to regulate itself.

Content-Based Brainwave Analysis—Memories are not unique. Janice Chen, Nature Neuroscience, DOI: 10.1038/nn.4450, showed that when people describe the episode from Sherlock Holmes drama, their brain activity patterns were almost exactly the same as each other's, for each scene. Moreover, there's also evidence that, when a person tells someone else about it, they implant that same activity into their brain as well. Moreover, research in which people who have not seen a movie listen to someone else's description of it, Chen et al. have found that the listener's brain activity looks much like that of the person who has seen it. See also “Our brains record and remember things in exactly the same way” by Andy Coghlan, New Scientist, Dec. 5, 2016 (www.newscientist.com/article/2115093-our-brains-record-and-remember-things-in-exactly-the-same-way/)

Brian Pasley, Frontiers in Neuroengineering, doi.org/whb, developed a technique for reading thoughts. The team hypothesized that hearing speech and thinking to oneself might spark some of the same neural signatures in the brain. They supposed that an algorithm trained to identify speech heard out loud might also be able to identify words that are thought. In the experiment, the decoder trained on speech was able to reconstruct which words several of the volunteers were thinking, using neural activity alone. See also “Hearing our inner voice” by Helen Thomson. New Scientist, Oct. 29, 2014 (www.newscientist.com/article/mg22429934-000-brain-decoder-can-eavesdrop-on-your-inner-voice/)

Jack Gallant et al. were able to detect which of a set of images someone was looking at from a brain scan, using software that compared the subject's brain activity while looking at an image with that captured while they were looking at “training” photographs. The program then picked the most likely match from a set of previously unseen pictures.

Ann Graybiel and Mark Howe used electrodes to analyze brainwaves in the ventromedial striatum of rats while they were taught to navigate a maze. As rats were learning the task, their brain activity showed bursts of fast gamma waves. Once the rats mastered the task, their brainwaves slowed to almost a quarter of their initial frequency, becoming beta waves. Graybiel's team posited that this transition reflects when learning becomes a habit.

Bernard Balleine, Proceedings of the National Academy of Sciences, DOI: 10.1073/pnas.1113158108. See also “Habits form when brainwaves slow down” by Wendy Zukerman. New Scientist, Sep. 26, 2011 (www.newscientist.com/article/dn20964-habits-form-when-brainwaves-slow-down/) posits that the slower brainwaves may be the brain weeding out excess activity to refine behavior. He suggests it might be possible to boost the rate at which they learn a skill by enhancing such beta-wave activity.

U.S. Pat. No. 9,763,592 provides a system for instructing a user behavior change comprising: collecting and analyzing bioelectrical signal datasets; and providing a behavior change suggestion based upon the analysis. A stimulus may be provided to prompt an action by the user, which may be visual, auditory, or haptic. See also U.S. Pat. No. 9,622,660, 20170041699; 20130317384; 20130317382; 20130314243; 20070173733; and 20070066914.

The chess game is a good example of a cognitive task which needs a lot of training and experience. A number of EEG studies have been done on chess players. Pawel Stepien, Wlodzimierz Klonowski and Nikolay Suvorov, Nonlinear analysis of EEG in chess players, EPJ Nonlinear Biomedical Physics 20153:1, showed heifer applicability of Higuchi Fractal Dimension method for analysis of EEG signals related to chess tasks than that of Sliding Window Empirical Mode Decomposition. The paper shows that the EEG signal during the game is more complex, non-linear, and non-stationary even when there are no significant differences between the game and relaxed state in the contribution of different EEG bands to total power of the signal. There is the need of gathering more data from more chess experts and of comparing them with data from novice chess players. See also Junior, L. R. S., Cesar, F. H. G., Rocha, F. T., and Thomaz, C. E. EEG and Eye Movement Maps of Chess Players. Proceedings of the Sixth International Conference on Pattern Recognition Applications and Methods. (ICPRAM 2017) pp. 343-441.(fei.edu.br/˜cet/icpram17_LaercioJunior.pdf).

Estimating EEG-based functional connectivity provides a useful tool for studying the relationship between brain activity and emotional states. See You-Yun Lee, Shulan Hsieh. Classifying Different Emotional States by Means of EEG-Based Functional Connectivity Patterns. Apr. 17, 2014, (doi.org/10.1371/journal.pone.0095415), which aimed to classify different emotional states by means of EEG-based functional connectivity patterns, and showed that the EEG-based functional connectivity change was significantly different among emotional states. Furthermore, the connectivity pattern was detected by pattern classification analysis using Quadratic Discriminant Analysis. The results indicated that the classification rate was better than chance. Estimating EEG-based functional connectivity provides a useful tool for studying the relationship between brain activity and emotional states.

NeuromodulationNeuroenhancement—Neuromodulation is the alteration of nerve activity through targeted delivery of a stimulus, such as electrical stimulation or chemical agents, to specific neurological sites in the body. It is carried out to normalize—or modulate—nervous tissue function. Neuromodulation is an evolving therapy that can involve a range of electromagnetic stimuli such as a magnetic field (TMS, rTMS), an electric current (TES, e.g., tDCS, HD-tDCS, tACS, electrosleep), or a drug instilled directly in the subdural space (intrathecal drug delivery). Emerging applications involve targeted introduction of genes or gene regulators and light (optogenetics). The most clinical experience has been with electrical stimulation. Neuromodulation, whether electrical or magnetic, employs the body's natural biological response by stimulating nerve cell activity that can influence populations of nerves by releasing transmitters, such as dopamine, or other chemical messengers such as the peptide Substance P, that can modulate the excitability and firing patterns of neural circuits. There may also be more direct electrophysiological effects on neural membranes. According to some applications, the end effect is a “normalization” of a neural network function from its perturbed state. Presumed mechanisms of action for neurostimulation include depolarizing blockade, stochastic normalization of neural firing, axonal blockade, reduction of neural firing keratosis, and suppression of neural network oscillations. Although the exact mechanisms of neurostimulation are not known, the empirical effectiveness has led to considerable application clinically.

Neuroenhancement refers to the targeted enhancement and extension of cognitive and affective abilities based on an understanding of their underlying neurobiology in healthy persons who do not have any mental illness. As such, it can be thought of as an umbrella term that encompasses pharmacological and non-pharmacological methods of improving cognitive, affective, and motor functionality, as well as the overarching ethico-legal discourse that accompanies these aims. Critically, for any agent to qualify as a neuroenhancer, it must reliably engender substantial cognitive, affective, or motor benefits beyond normal functioning in healthy individuals (or in select groups of individuals having pathology), whilst causing few side effects: at most at the level of commonly used comparable legal substances or activities, such as caffeine, alcohol, and sleep-deprivation. Pharmacological neuroenhancement agents include the well-validated nootropics, such as racetam, vinpocetine, and phosphatidylserine, as well as other drugs used for treating patients suffering from neurological disorders. Non-pharmacological measures include non-invasive brain stimulation, which has been employed to improve various cognitive and affective functions, and brain-machine interfaces, which hold much potential to extend the repertoire of motor and cognitive actions available to humans.

Brain Stimulation—Non-invasive brain stimulation (NIBS) bypasses the correlative approaches of other imaging techniques, making it possible to establish a causal relationship between cognitive processes and the functioning of specific brain areas. NIBS can provide information about where a particular process occurs. NIBS offers the opportunity to study brain mechanisms beyond process localization, providing information about when activity in a given brain region is involved in a cognitive process, and even how it is involved. When using NIBS to explore cognitive processes, it is important to understand not only how NIBS functions but also the functioning of the neural structures themselves. Non-invasive brain stimulation (NIBS) methods, which include transcranial magnetic stimulation (TMS) and transcranial electric stimulation (TES), are used in cognitive neuroscience to induce transient changes in brain activity and thereby alter the behavior of the subject.

The application of NIBS aims at establishing the role of a given cortical area in an ongoing specific motor, perceptual or cognitive process. Physically, NIBS techniques affect neuronal states through different mechanisms. In TMS, a solenoid (coil) is used to deliver a strong and transient magnetic field, or “pulse,” to induce a transitory electric current at the cortical surface beneath the coil. The pulse causes the rapid and above-threshold depolarization of cell membranes affected by the current, followed by the transynaptic depolarization or hyperpolarization of interconnected neurons. Therefore, strong TMS can induce a current that elicits action potentials in neurons, while weak (subthreshold) can modify susceptibility of cells to depolarization. A complex set of coils can deliver a complex 3D excitation field. By contrast, in TES techniques, the stimulation involves the application of weak electrical currents directly to the scalp through a pair of electrodes. As a result, TES induces a subthreshold polarization of cortical neurons that is too weak to generate an action potential. (Superthreshold tES corresponds to electroconvulsive therapy, which is a currently disfavored, but apparently effective treatment for depression). However, by changing the intrinsic neuronal excitability, TES can induce changes in the resting membrane potential and the postsynaptic activity of cortical neurons. This, in turn, can alter the spontaneous firing rate of neurons and modulate their response to afferent signals, leading to changes in synaptic efficacy. The typical application of NIBS involves different types of protocols: TMS can be delivered as a single pulse (spTMS) at a precise time, as pairs of pulses separated by a variable interval, or as a series of stimuli in conventional or patterned protocols of repetitive TMS (rTMS). In TES, different protocols are established by the electrical current used and by its polarity, which can be direct (anodal or cathodal transcranial direct current stimulation: tDCS), alternating at a fix frequency (transcranial alternating current stimulation: tACS), oscillating transcranial direct current stimulation (osc-tDCS), high-definition transcranial direct current stimulation (HD-tDCS), or at random frequencies (transcranial random noise stimulation: tRNS).

In general, the final effects of NIBS on the central nervous system depend on a lengthy list of parameters (e.g., frequency, temporal characteristics, intensity, geometric configuration of the coil electrode, current direction), when it is delivered before (off-line) or during (on-line) the task as part of the experimental procedure. In addition, these factors interact with several variables related to the anatomy (e.g., properties of the brain tissue and its location), as well as physiological (e.g., gender and age) and cognitive states of the stimulated area subject. The entrainment hypothesis, suggests the possibility of inducing a particular oscillation frequency in the brain using an external oscillatory force (e.g., rTMS, but also tACS). The physiological basis of oscillatory cortical activity lies in the timing of the interacting neurons; when groups of neurons synchronize their firing activities, brain rhythms emerge, network oscillations are generated, and the basis for interactions between brain areas may develop. Because of the variety of experimental protocols for brain stimulation, limits on descriptions of the actual protocols employed, and limited controls, consistency of reported studies is lacking, and extrapolability is limited. Thus, while there is some consensus in various aspects of the effects of extra cranial brain stimulation, the results achieved have a degree of uncertainty dependent on details of implementation. On the other hand, within a specific experimental protocol, it is possible to obtain statistically significant and repeatable results. This implies that feedback control might be effective to control implementation of the stimulation for a given purpose; however, prior studies that employ feedback control are lacking.

Changes in the neuronal threshold result from changes in membrane permeability (Liebetanz et al., 2002), which influence the response of the task-related network. The same mechanism of action may be responsible for both TES methods and TMS, i.e., the induction of noise in the system. However, the neural activity induced by TES will be highly influenced by the state of the system because it is a neuromodulatory method (Paulus, 2011), and its effect will depend on the activity of the stimulated area. Therefore, the final result will depend strongly on the task characteristics, the system state and the way in which TES will interact with such a state.

In TMS, the magnetic pulse causes a rapid increase in current flow, which can in some cases cause and above-threshold depolarization of cell membranes affected by the current, triggering an action potential, and leading to the trans-synaptic depolarization or hyperpolarization of connected cortical neurons, depending on their natural response to the firing of the stimulated neuron(s). Therefore, TMS activates a neural population that, depending on several factors, can be congruent (facilitate) or incongruent (inhibit) with task execution. TES induces a polarization of cortical neurons at a subthreshold level that is too weak to evoke an action potential. However, by inducing a polarity shift in the intrinsic neuronal excitability, TES can alter the spontaneous firing rate of neurons and modulate the response to afferent signals. In this sense, TES-induced effects are even more bound to the state of the stimulated area that is determined by the conditions. In short, NIBS leads to a stimulation-induced modulation of the state that can be substantially defined as noise induction. Induced noise will not be just random activity, but will depend on the interaction of many parameters, from the characteristics of the stimulation to the state.

Although the types and number of neurons “triggered” by NIBS are theoretically random, the induced change in neuronal activity is likely to be correlated with ongoing activity, yet even if we are referring to a non-deterministic process, the noise introduced will not be a totally random element. Because it will be partially determined by the experimental variables, the level of noise that will be introduced by the stimulation and by the context can be estimated, as well as the interaction between the two levels of noise (stimulation and context). Known transcranial stimulation does not permit stimulation with a focused and highly targeted signal to a dearly defined area of the brain to establish a unique brain-behavior relationship; therefore, the known introduced stimulus activity in the brain stimulation is ‘noise.’

Cosmetic neuroscience has emerged as a new field of research. Roy Hamilton, Samuel Messing, and Anion Chafterjee, “Rethinking the thinking cap—Ethics of neural enhancement using noninvasive brain stimulation.” Neurology, Jan. 11, 2011, vol. 76 no. 2 187-193. (www.neurology.org/content/76/2/187.) discuss the use noninvasive brain stimulation techniques such as transcranial magnetic stimulation and transcranial direct current stimulation to enhance neurologic function: cognitive skills, mood, and social cognition.

Electrical brain stimulation (EBS), or focal brain stimulation (FBS), is a form of clinical neurobiology electrotherapy used to stimulate a neuron or neural network in the brain through the direct or indirect excitation of cell membranes using an electric current. See, en.wikipedia.org/wiki/Electrical_brain_stimulation; U.S. Patent and Pub. App. Nos. U.S. Pat. Nos. 7,753,836; 7,94673; 8,545,378; 9,345,901; 9,610,456; 9,694,178; 20140330337; 20150112403; and 20150119689.

Motor skills can be affected by CNS stimulation.

See, U.S. Pub. App. Nos. U.S. Pat. Nos. 5,343,871; 5,742,748; 6,057,846; 6,390,979; 6,644,976; 6,656,137; 7,063,535; 7,558,622; 7,618,381; 7,733,224; 7,829,562; 7,863,272; 8,016,597; 8,065,240; 8,069,125; 8,108,036; 8,126,542; 8,150,796; 8,195,593; 8,356,004; 8,449,471; 8,461,988; 8,525,673; 8,525,687; 8,531,291; 8,591,419; 8,606,592; 8,615,479; 8,680,991; 8,682,449; 8,706,518; 8,747,336; 8,750,971; 8,764,651; 8,784,109; 8,858,440; 8,862,236; 8,938,289; 8,962,042; 9,005,649; 9,064,036; 9,107,586; 9,125,788; 9,138,579; 9,149,599; 9,173,582; 9,204,796; 9,211,077; 9,265,458; 9,351,640; 9,358,361; 9,380,976; 9,403,038; 9,418,368; 9,468,541; 9,495,684; 9,545,515; 9,549,691; 9,560,967; 9,577,992; 9,590,986; 20030068605; 20040072133; 20050020483; 20050032827; 20050059689; 20050153268; 20060014753; 20060052386; 20060106326; 20060191543; 20060229164; 20070031798; 20070138886; 20070276270; 20080001735; 20080004904; 20080243005; 20080287821; 20080294019; 20090005654; 20090018407; 20090024050; 20090118593; 20090119154; 20090132275; 20090156907; 20090156955; 20090157323; 20090157481; 20090157482; 20090157625; 20090157660; 20090157751; 20090157813; 20090163777; 20090164131; 20090164132; 20090164302; 20090164401; 20090164403; 20090164458; 20090164503; 20090164549; 20090171164; 20090172540; 20090221928; 20090267758; 20090271011; 20090271120; 20090271347; 20090312595; 20090312668; 20090318773; 20090318779; 20090319002; 20100004762; 20100015583; 20100017001; 20100022820; 20100041958; 20100042578; 20100063368; 20100069724; 20100076249; 20100081860; 20100081861; 20100100036; 20100125561; 20100130811; 20100145219; 20100163027; 20100163035; 20100168525; 20100168602; 20100280332; 20110015209; 20110015469; 20110082154; 20110105859; 20110115624; 20110152284; 20110178441; 20110181422; 20110288119; 20120092156; 20120092157; 20120130300; 20120143104; 20120164613; 20120177716; 20120316793; 20120330109; 20130009783; 20130018592; 20130034837; 20130053656; 20130054215; 20130085678; 20130121984; 20130132029; 20130137717; 20130144537; 20130184728; 20130184997; 20130211291; 20130231574; 20130281890; 20130289385; 20130330428; 20140039571; 20140058528; 20140077946; 20140094720; 20140104059; 20140148479; 20140155430; 20140163425; 20140207224; 20140235965; 20140249429; 20150025410; 20150025422; 20150068069; 20150071907; 20150141773; 20150208982; 20150265583; 20150290419; 20150294067; 20150294085; 20150294086; 20150359467; 20150379878; 20160001096; 20160007904; 20160007915; 20160030749; 20160030750; 20160067492; 20160074657; 20160120437; 20160140834; 20160198968; 20160206671; 20160220821; 20160303402; 20160351069; 20160360965; 20170046971; 20170065638; 20170080320; 20170084187; 20170086672; 20170112947; 20170127727; 20170131293; 20170143966; 20170151436; 20170157343; and 20170193831.

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Transcranial Electrical Stimulation (TES)—TES (tDCS, HD-tDCS, osc-tDCS, tACS, and tRNS) is a set of noninvasive method of cortical stimulation, using weak direct currents to polarize target brain regions. The most used and best-known method is tDCS, as all considerations for the use of tDCS have been extended to the other TES methods. The hypotheses concerning the application of tDCS in cognition are very similar to those of TMS, with the exception that tDCS was never considered a virtual lesion method. tDCS can increase or decrease cortical excitability in the stimulated brain regions and facilitate or inhibit behavior accordingly. TES does not induce action potentials but instead modulates the neuronal response threshold so that it can be defined as subthreshold stimulation.

Michael A. Nitsche, and Armin Kibele. “Noninvasive brain stimulation and neural entrainment enhance athletic performance-a review.” J. Cognitive Enhancement 1.1(2017): 73-79, discusses that non-invasive brain stimulation (NIBS) bypasses the correlative approaches of other imaging techniques, making it possible to establish a causal relationship between cognitive processes and the functioning of specific brain areas. NIBS can provide information about where a particular process occurs. NIBS offers the opportunity to study brain mechanisms beyond process localization, providing information about when activity in a given brain region is involved in a cognitive process, and even how it is involved. When using NIBS to explore cognitive processes, it is important to understand not only how NIBS functions but also the functioning of the neural structures themselves. Non-invasive brain stimulation (NIBS) methods, which include transcranial magnetic stimulation (TMS) and transcranial electric stimulation (TES), are used in cognitive neuroscience to induce transient changes in brain activity and thereby alter the behavior of the subject. The application of NIBS aims at establishing the role of a given cortical area in an ongoing specific motor, perceptual or cognitive process (Hallett, 2000; Walsh and Cowey, 2000). Physically, NIBS techniques affect neuronal states through different mechanisms. In TMS, a solenoid (coil) is used to deliver a strong and transient magnetic field, or “pulse,” to induce a transitory electric current at the cortical surface beneath the coil. (US 2004078056) The pulse causes the rapid and above-threshold depolarization of cell membranes affected by the current (Barker et al., 1985, 1987), followed by the transynaptic depolarization or hyperpolarization of interconnected neurons. Therefore, TMS induces a current that elicits action potentials in neurons. A complex set of coils can deliver a complex 3D excitation field. By contrast, in TES techniques, the stimulation involves the application of weak electrical currents directly to the scalp through a pair of electrodes (Nitsche and Paulus, 2000; Priori et al., 1998). As a result, TES induces a subthreshold polarization of cortical neurons that is too weak to generate an action potential. However, by changing the intrinsic neuronal excitability, TES can induce changes in the resting membrane potential and the postsynaptic activity of cortical neurons. This, in turn, can alter the spontaneous firing rate of neurons and modulate their response to afferent signals (Bindman et al., 1962, 1964, 1979; Creutzfeldt et al., 1962), leading to changes in synaptic efficacy. The typical application of NIBS involves different types of protocols: TMS can be delivered as a single pulse (spTMS) at a precise time, as pairs of pulses separated by a variable interval, or as a series of stimuli in conventional or patterned protocols of repetitive TMS (rTMS) (for a complete classification see Rossi et al., 2009). In TES, different protocols are established by the electrical current used and by its polarity, which can be direct (anodal or cathodal transcranial direct current stimulation: tDCS), high-definition transcranial direct current stimulation (HD4DCS), oscillating transcranial direct current stimulation (osc-tDCS), alternating at a fix frequency (transcranial alternating current stimulation: tACS) or at random frequencies (transcranial random noise stimulation: tRNS) (Nitsche et al., 2008; Paulus, 2011). In general, the final effects of NIBS on the central nervous system depend on a lengthy list of parameters (e.g., frequency, temporal characteristics, intensity, geometric configuration of the coil electrode, current direction), when it is delivered before (off-line) or during (on-line) the task as part of the experimental procedure (e.g., Jacobson et al., 2011; Nitsche and Paulus, 2011; Sandrini et al., 2011). In addition, these factors interact with several variables related to the anatomy (e.g., properties of the brain tissue and its location, Radman et al., 2007), as well as physiological (e.g., gender and age, Landi and Rossini, 2010; Lang et al., 2011; Ridding and Ziemann, 2010) and cognitive (e.g., Miniussi et al., 2010; Silvanto et al., 2008; Walsh et al., 1998) states of the stimulated area/subject.

Transcranial Direct Current Stimulation (tDCS)—Cranial electrotherapy stimulation (CES) is a form of non-invasive brain stimulation that applies a small, pulsed electric current across a person's head to treat a variety of conditions such as anxiety, depression and insomnia. See, en.wikipedia.org/wiki/Cranial_electrotherapy_stimulation. Transcranial direct current stimulation (tDCS) is a form of neurostimulation that uses constant, low current delivered to the brain area of interest via electrodes on the scalp. It was originally developed to help patients with brain injuries or psychiatric conditions like major depressive disorder. tDCS appears to have some potential for treating depression. See, en.wikipedia.org/wiki/Transcranial_direct-current_stimulation.

tDCS is being studied for acceleration of learning. The mild electrical shock (usually, a 2-milliamp current) is used to depolarize the neuronal membranes, making the cells more excitable and responsive to inputs. Weisend, Experimental Brain Research, vol 213, p 9 (DARPA) showed that tDCS accelerates the formation of new neural pathways during the time that someone practices a skill. tDCS appears to bring about the flow state. The movements of the subjects become more automatic; they report calm, focused concentration, and their performance improves immediately. (See Adee, Sally, “Zap your brain into the zone: Fast track to pure focus”, New Scientist, No. 2850, Feb. 1, 2012, www.newscientist.com/article/mg21328501-600-zap-your-brain-into-the-zone-fast-track-to-pure- focus/).

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Reinhart, Robert M G. “Disruption and rescue of interareal theta phase coupling and adaptive behavior.” Proceedings of the National Academy of Sciences (2017): provide evidence for a causal relation between interareal theta phase synchronization in frontal cortex and multiple components of adaptive human behavior. Reinhart's results support the idea that the precise timing of rhythmic population activity spatially distributed in frontal cortex conveys information to direct behavior. Given prior work showing that phase synchronization can change spike time-dependent plasticity, together with Reihart's findings showing stimulation effects on neural activity and behavior can outlast a 20-min period of electrical stimulation, it is reasonable to suppose that the externally modulated interareal coupling changed behavior by causing neuroplastic modifications in functional connectivity. Reinhart suggests that we may be able to noninvasively intervene in the temporal coupling of distant rhythmic activity in the human brain to optimize (or impede) the postsynaptic effect of spikes from one area on the other, improving (or impairing) the cross-area communication necessary for cognitive action control and learning. Moreover, these neuroplastic alterations in functional connectivity were induced with a 0° phase, suggesting that inducing synchronization does not require a meticulous accounting of the communication delay between regions such as MFC and IPFC to effectively modify behavior and learning. This conforms to work showing that despite long axonal conduction delays between distant brain areas, theta phase synchronizations at 0° phase lag can occur between these regions and underlie meaningful functions of cognition and action. It is also possible that a third subcortical or posterior region with a nonzero time lag interacted with these two frontal areas to drive changes in goal-directed behavior.

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High-Definition-tDCS—High-Definition transcranial Direct Current Stimulation (HD-tDCS) was invented at The City University of New York with the introduction of the 4×1 HD-tDCS montage. The 4×1 HD-tDCS montage allows precise targeting of cortical structures. The region of current flow is circumscribed by the area of the 4× ring, such that decreasing ring radius increases focality. 4×1 HD-tDCS allows for unifocal stimulation, meaning the polarity of the center 1× electrode will determine the direction of neuromodulation under the ring. This is in contrast to conventional tDCS where the need for one anode and one cathode always produces bidirectional modulation (even when an extra-cephalic electrode is used). 4×1 HD-tDCS thus provides the ability not only to select a cortical brain region to target, but to modulate the excitability of that brain region with a designed polarity without having to consider return counter-electrode flow.

Transcranial Alternative Current Stimulation (tACS)—Transcranial alternating current stimulation (tACS) is a noninvasive means by which alternating electrical current applied through the skin and skull entrains in a frequency-specific fashion the neural oscillations of the underlying brain. See, en.wikipedia.org/wiki/Transcranial_alternating_current_stimulation

U.S. Pub. App. No. 20170197081 discloses transdermal electrical stimulation of nerves to modify or induce a cognitive state using transdermal electrical stimulation (TES).

Transcranial alternating current stimulation (tACS) is a noninvasive means by which alternating electrical current applied through the skin and skull entrains in a frequency-specific fashion the neural oscillations of the underlying brain. See, en.wikipedia.org/wiki/Transcranial_alternating_current_stimulation;

U.S. Patent and Pub. App. Nos. U.S. Pat. Nos. 6,804,558; 7,149,773; 7,181,505; 7,278,966; 9,042,201; 9,629,568; 9,713,433; 20010051787; 20020013613; 20020052539; 20020082665; 20050171410; 20140211593; 20140316243; 20150174418; 20150343242; 20160000354; 20160038049; 20160106513; 20160213276; 20160228702; 20160232330; 20160235323; and 20170113056.

Transcranial Random Noise Stimulation (tRNS)—Transcranial random noise stimulation (tRNS) is a non-invasive brain stimulation technique and a form of transcranial electrical stimulation (TES). See, en.wikipedia.org/wiki/Transcranial_random_noise_stimulation; U.S. Patent and Pub. App. Nos. U.S. Pat. Nos. 9,198,733; 9,713,433; 20140316243; 20160038049; and 20160213276.

The stimulus may comprise transcranial pulsed current stimulation (tPCS). See:

Shapour Jaberzadeh, Andisheh Bastani, Maryam Zoghi, “Anodel transcranial pulsed current stimulation: A novel technique to enhance corticospinal excitability,” Clin. Neurophysiology, Volume 125, Issue 2, February 2014, Pages 344-351, doi.org/10.1016/j.dinph.2013.08.025;

earthpulse.net/tpcs-transcranial-pulsed-current-stimulation/; helpfoc.us/article/16-tpcs-transcranial-pulsed-current-stimulation.

Transcranial Magnetic Stimulation (TMS)—Transcranial magnetic stimulation (TMS) is a method in which a changing magnetic field is used to cause electric current to flow in a small region of the brain via electromagnetic induction. During a TMS procedure, a magnetic field generator, or “coil”, is placed near the head of the person receiving the treatment. The coil is connected to a pulse generator, or stimulator, that delivers a changing electric to the coil. TMS is used diagnostically to measure the connection between the central nervous system and skeletal muscle to evaluate damage in a wide variety of disease states, including stroke, multiple sclerosis, amyotrophic lateral sclerosis, movement disorders, and motor neuron diseases. Evidence is available suggesting that TMS is useful in treating neuropathic pain, major depressive disorder, and other conditions.

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Pulsed electromagnetic field (PEMF)—PEMF, when applied to the brain is referred to as Transcranial magnetic stimulation, and has been FDA approved since 2008 for use in people who failed to respond to antidepressants. Weak magnetic stimulation of the brain is often called transcranial pulsed electromagnetic field (tPEMF) therapy. See, en.wikipedia.org/wiki/Pulsed_electromagnetic_field_therapy,

See, U.S. Patent and Pub. App. Nos. U.S. Pat. Nos. 7,280,861; 8,343,027; 8,415,123; 8,430,805; 8,435,166; 8,571,642; 8,657,732; 8,775,340; 8,961,385; 8,968,172; 9,002,477; 9,005,102; 9,278,231; 9,320,913; 9,339,641; 9,387,338; 9,415,233; 9,427,598; 9,433,797; 9,440,089; 9,610,459; 9,630,004; 9,656,096; 20030181791; 20060129022; 20100057655; 20100197993; 20120101544; 20120116149; 20120143285; 20120253101; 20130013339; 20140213843; 20140213844; 20140221726; 20140228620; 20140303425; 20160235983; 20170087367; and 20170165496.

Deep Brain Stimulation (DBS)—DBS is a neurosurgical procedure involving the implantation of a medical device called a neurostimulator (sometimes referred to as a ‘brain pacemaker’), which sends electrical impulses, through implanted electrodes, to specific targets in the brain (brain nuclei) for the treatment of movement and neuropsychiatric disorders. See, en.wikipedia.org/wiki/Deep_brain_stimulation;

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Transcranial Pulse Ultrasound (TPU)—TPU uses low intensity, low frequency ultrasound (LILFU) as a method to stimulate the brain. See, en.wikipedia.org/wiki/Transcranial_pulsed_ultrasound;

U.S. Pat. Nos. 8,591,419; 8,858,440; 8,903,494; 8,921,320; 9,002,458; 9,014,811; 9,036,844; 9,042,201; 9,061,133; 9,233,244; 9,333,334; 9,399,126; 9,403,038; 9,440,070; 9,630,029; 9,669,239; 20120259249; 20120283502; 20120289869; 20130079621; 20130144192; 20130184218; 20140058219; 20140211593; 20140228653; 20140249454; 20140316243; 20150080327; 20150133716; 20150343242; 20160143541; 20160176053; and 20160220850.

Sensory Stimulation—Light, sound or electromagnetic fields may be used to remotely convey a temporal pattern of brainwaves. See:

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Light Stimulation—The functional relevance of brain oscillations in the alpha frequency range (8-13 Hz) has been repeatedly investigated through the use of rhythmic visual stimulation. There are two hypotheses on the origin of steady-state visual evoked potential (SSVEP) measured in EEG during rhythmic stimulation: entrainment of brain oscillations and superposition of event-related responses (ERPs). The entrainment but not the superposition hypothesis justifies rhythmic visual stimulation as a means to manipulate brain oscillations, because superposition assumes a linear summation of single responses, independent from ongoing brain oscillations. Participants stimulated with rhythmic flickering light of different frequencies and intensities, and entrainment was measured by comparing the phase coupling of brain oscillations stimulated by rhythmic visual flicker with the oscillations induced by arrhythmic littered stimulation, varying the time, stimulation frequency, and intensity conditions. Phase coupling was found to be more pronounced with increasing stimulation intensity as well as at stimulation frequencies closer to each participant's intrinsic frequency. Even in a single sequence of an SSVEP, non-linear features (intermittency of phase locking) was found that contradict the linear summation of single responses, as assumed by the superposition hypothesis. Thus, evidence suggests that visual rhythmic stimulation entrains brain oscillations, validating the approach of rhythmic stimulation as a manipulation of brain oscillations. See, Notbohm A, Kurths J, Herrmann C S, Modification of Brain Oscillations via Rhythmic Light Stimulation Provides Evidence for Entrainment but Not for Superposition of Event-Related Responses, Front Hum Neurosci. 2016 Feb. 3; 10:10. doi: 10.3389fnhum.2016.00010. eCollection 2016.

It is also known that periodic visual stimulation can trigger epileptic seizures.

Cochlear Implant—A cochlear implant is a surgically implanted electronic device that provides a sense of sound to a person who is profoundly deaf or severely hard of hearing in both ears. See, en.wikipedia.org/wiki/Cochlear_implant;

See, U.S. Patent and Pub. App. Nos. U.S. Pat. Nos. 5,999,856; 6,354,299; 6,427,086; 6,430,443; 6,665,562; 6,873,872; 7,359,837; 7,440,806; 7,493,171; 7,610,083; 7,610,100; 7,702,387; 7,747,318; 7,765,088; 7,853,321; 7,890,176; 7,917,199; 7,920,916; 7,957,806; 8,014,870; 8,024,029; 8,065,017; 8,108,033; 8,108,042; 8,140,152; 8,165,687; 8,175,700; 8,195,295; 8,209,018; 8,224,431; 8,315,704; 8,332,024; 8,401,654; 8,433,410; 8,478,417; 8,515,541; 8,538,543; 8,560,041; 8,565,864; 8,574,164; 8,577,464; 8,577,465; 8,577,466; 8,577,467; 8,577,468; 8,577,472; 8,577,478; 8,588,941; 8,594,800; 8,644,946; 8,644,957; 8,652,187; 8,676,325; 8,696,724; 8,700,183; 8,718,776; 8,768,446; 8,768,477; 8,788,057; 8,798,728; 8,798,773; 8,812,126; 8,864,806; 8,868,189; 8,929,999; 8,968,376; 8,989,868; 8,996,120; 9,002,471; 9,044,612; 9,061,132; 9,061,151; 9,095,713; 9,135,400; 9,186,503; 9,235,685; 9,242,067; 9,248,290; 9,248,291; 9,259,177; 9,302,093; 9,314,613; 9,327,069; 9,352,145; 9,352,152; 9,358,392; 9,358,393; 9,403,009; 9,409,013; 9,415,215; 9,415,216; 9,421,372; 9,432,777; 9,501,829; 9,526,902; 9,533,144; 9,545,510; 9,550,064; 9,561,380; 9,578,425; 9,592,389; 9,604,067; 9,616,227; 9,643,017; 9,649,493; 9,674,621; 9,682,232; 9,743,197; 9,744,358; 20010014818; 20010029391; 20020099412; 20030114886; 20040073273; 20050149157; 20050182389; 20050182450; 20050182467; 20050182468; 20050182469; 20050187600; 20050192647; 20050209664; 20050209665; 20050209666; 20050228451; 20050240229; 20060064140; 20060094970; 20060094971; 20060094972; 20060095091; 20060095092; 20060161217; 20060173259; 20060178709; 20060195039; 20060206165; 20060235484; 20060235489; 20060247728; 20060282123; 20060287691; 20070038264; 20070049988; 20070156180; 20070198063; 20070213785; 20070244407; 20070255155; 20070255531; 20080049376; 20080140149; 20080161886; 20080208280; 20080235469; 20080249589; 20090163980; 20090163981; 20090243756; 20090259277; 20090270944; 20090280153; 20100030287; 20100100164; 20100198282; 20100217341; 20100231327; 20100241195; 20100268055; 20100268288; 20100318160; 20110004283; 20110060382; 20110166471; 20110295344; 20110295345; 20110295346; 20110295347; 20120035698; 20120116179; 20120116741; 20120150255; 20120245655; 20120262250; 20120265270; 20130165996; 20130197944; 20130235550; 20140032512; 20140098981; 20140200623; 20140249608; 20140275847; 20140330357; 20140350634; 20150018699; 20150045607; 20150051668; 20150065831; 20150066124; 20150080674; 20150328455; 20150374986; 20150374987; 20160067485; 20160243362; 20160261962; 20170056655; 20170087354; 20170087355; 20170087356; 20170113046; 20170117866; 20170135633; and 20170182312.

Vagus Nerve Stimulation (VNS)—VNS is a medical treatment that involves delivering electrical impulses to the vagus nerve. It is used as an adjunctive treatment for certain types of intractable epilepsy and treatment-resistant depression. See, en.wikipedia.org/wiki/Vagus_nerve_stimulation;

See, U.S. Patent and Pub. Pat. Nos. U.S. Pat. Nos. 5,215,086; 5,231,988; 5,299,569; 5,335,657; 5,571,150; 5,928,272; 5,995,868; 6,104,956; 6,167,311; 6,205,359; 6,208,902; 6,248,126; 6,269,270; 6,339,725; 6,341,236; 6,356,788; 6,366,814; 6,418,344; 6,497,699; 6,549,804; 6,556,868; 6,560,486; 6,587,727; 6,591,137; 6,597,954; 6,609,030; 6,622,047; 6,665,562; 6,671,556; 6,684,105; 6,708,064; 6,735,475; 6,782,292; 6,788,975; 6,873,872; 6,879,859; 6,882,881; 6,920,357; 6,961,618; 7,003,352; 7,151,961; 7,155,279; 7,167,751; 7,177,678; 7,203,548; 7,209,787; 7,228,167; 7,231,254; 7,242,984; 7,277,758; 7,292,890; 7,313,442; 7,324,851; 7,346,395; 7,366,571; 7,386,347; 7,389,144; 7,403,820; 7,418,290; 7,422,555; 7,444,184; 7,454,245; 7,457,665; 7,463,927; 7,486,986; 7,493,172; 7,499,752; 7,561,918; 7,620,455; 7,623,927; 7,623,928; 7,630,757; 7,634,317; 7,643,881; 7,653,433; 7,657,316; 7,676,263; 7,680,526; 7,684,858; 7,706,871; 7,711,432; 7,734,355; 7,736,382; 7,747,325; 7,747,326; 7,769,461; 7,783,362; 7,801,601; 7,805,203; 7,840,280; 7,848,803; 7,853,321; 7,853,329; 7,860,548; 7,860,570; 7,865,244; 7,869,867; 7,869,884; 7,869,885; 7,890,185; 7,894,903; 7,899,539; 7,904,134; 7,904,151; 7,904,175; 7,908,008; 7,920,915; 7,925,353; 7,945,316; 7,957,796; 7,962,214; 7,962,219; 7,962,220; 7,974,688; 7,974,693; 7,974,697; 7,974,701; 7,996,079; 8,000,788; 8,027,730; 8,036,745; 8,041,418; 8,041,419; 8,046,076; 8,064,994; 8,068,911; 8,097,926; 8,108,038; 8,112,148; 8,112,153; 8,116,883; 8,150,508; 8,150,524; 8,160,696; 8,172,759; 8,180,601; 8,190,251; 8,190,264; 8,204,603; 8,209,009; 8,209,019; 8,214,035; 8,219,188; 8,224,444; 8,224,451; 8,229,559; 8,239,028; 8,260,426; 8,280,505; 8,306,627; 8,315,703; 8,315,704; 8,326,418; 8,337,404; 8,340,771; 8,346,354; 8,352,031; 8,374,696; 8,374,701; 8,379,952; 8,382,667; 8,401,634; 8,412,334; 8,412,338; 8,417,344; 8,423,155; 8,428,726; 8,452,387; 8,454,555; 8,457,747; 8,467,878; 8,478,428; 8,485,979; 8,489,185; 8,498,699; 8,515,538; 8,536,667; 8,538,523; 8,538,543; 8,548,583; 8,548,594; 8,548,604; 8,560,073; 8,562,536; 8,562,660; 8,565,867; 8,571,643; 8,571,653; 8,588,933; 8,591,419; 8,600,521; 8,603,790; 8,606,360; 8,615,309; 8,630,705; 8,634,922; 8,641,646; 8,644,954; 8,649,871; 8,652,187; 8,660,666; 8,666,501; 8,676,324; 8,676,330; 8,684,921; 8,694,118; 8,700,163; 8,712,547; 8,716,447; 8,718,779; 8,725,243; 8,738,126; 8,744,562; 8,761,868; 8,762,065; 8,768,471; 8,781,597; 8,815,582; 8,827,912; 8,831,732; 8,843,210; 8,849,409; 8,852,100; 8,855,775; 8,858,440; 8,864,806; 8,868,172; 8,868,177; 8,874,205; 8,874,218; 8,874,227; 8,888,702; 8,914,122; 8,918,178; 8,934,967; 8,942,817; 8,945,006; 8,948,855; 8,965,514; 8,968,376; 8,972,004; 8,972,013; 8,983,155; 8,983,628; 8,983,629; 8,985,119; 8,989,863; 8,989,867; 9,014,804; 9,014,823; 9,020,582; 9,020,598; 9,020,789; 9,026,218; 9,031,655; 9,042,201; 9,042,988; 9,043,001; 9,044,188; 9,050,469; 9,056,195; 9,067,054; 9,067,070; 9,079,940; 9,089,707; 9,089,719; 9,095,303; 9,095,314; 9,108,041; 9,113,801; 9,119,533; 9,135,400; 9,138,580; 9,162,051; 9,162,052; 9,174,045; 9,174,066; 9,186,060; 9,186,106; 9,204,838; 9,204,998; 9,220,910; 9,233,246; 9,233,258; 9,235,685; 9,238,150; 9,241,647; 9,242,067; 9,242,092; 9,248,286; 9,249,200; 9,249,234; 9,254,383; 9,259,591; 9,265,660; 9,265,661; 9,265,662; 9,265,663; 9,265,931; 9,265,946; 9,272,145; 9,283,394; 9,284,353; 9,289,599; 9,302,109; 9,309,296; 9,314,633; 9,314,635; 9,320,900; 9,326,720; 9,332,939; 9,333,347; 9,339,654; 9,345,886; 9,358,381; 9,359,449; 9,364,674; 9,365,628; 9,375,571; 9,375,573; 9,381,346; 9,394,347; 9,399,133; 9,399,134; 9,402,994; 9,403,000; 9,403,001; 9,403,038; 9,409,022; 9,409,028; 9,415,219; 9,415,222; 9,427,581; 9,440,063; 9,458,208; 9,468,761; 9,474,852; 9,480,845; 9,492,656; 9,492,678; 9,501,829; 9,504,390; 9,505,817; 9,522,085; 9,522,282; 9,526,902; 9,533,147; 9,533,151; 9,538,951; 9,545,226; 9,545,510; 9,561,380; 9,566,426; 9,579,506; 9,586,047; 9,592,003; 9,592,004; 9,592,409; 9,604,067; 9,604,073; 9,610,442; 9,622,675; 9,623,240; 9,643,017; 9,643,019; 9,656,075; 9,662,069; 9,662,490; 9,675,794; 9,675,809; 9,682,232; 9,682,241; 9,700,256; 9,700,716; 9,700,723; 9,707,390; 9,707,391; 9,717,904; 9,729,252; 9,737,230; 20010003799; 20010029391; 20020013612; 20020072776; 20020072782; 20020099417; 20020099418; 20020151939; 20030023282; 20030045914; 20030083716; 20030114886; 20030181954; 20030195574; 20030236557; 20030236558; 20040015204; 20040015205; 20040073273; 20040138721; 20040153129; 20040172089; 20040172091; 20040172094; 20040193220; 20040243182; 20040260356; 20050027284; 20050033379; 20050043774; 20050049651; 20050137645; 20050149123; 20050149157; 20050154419; 20050154426; 20050165458; 20050182288; 20050182450; 20050182453; 20050182467; 20050182468; 20050182469; 20050187600; 20050192644; 20050192647; 20050197590; 20050197675; 20050197678; 20050209654; 20050209664; 20050209665; 20050209666; 20050216070; 20050216071; 20050251220; 20050267542; 20060009815; 20060047325; 20060052657; 20060064138; 20060064139; 20060064140; 20060079936; 20060111644; 20060129202; 20060142802; 20060155348; 20060167497; 20060173493; 20060173494; 20060173495; 20060195154; 20060206155; 20060212090; 20060212091; 20060217781; 20060224216; 20060259077; 20060282123; 20060293721; 20060293723; 20070005115; 20070021800; 20070043401; 20070060954; 20070060984; 20070066997; 20070067003; 20070067004; 20070093870; 20070100377; 20070100378; 20070100392; 20070112404; 20070150024; 20070150025; 20070162085; 20070173902; 20070198063; 20070213786; 20070233192; 20070233193; 20070255320; 20070255379; 20080021341; 20080027347; 20080027348; 20080027515; 20080033502; 20080039904; 20080065183; 20080077191; 20080086182; 20080091240; 20080125829; 20080140141; 20080147137; 20080154332; 20080161894; 20080167571; 20080183097; 20080269542; 20080269833; 20080269834; 20080269840; 20090018462; 20090036950; 20090054946; 20090088680; 20090093403; 20090118780; 20090163982; 20090171405; 20090187230; 20090234419; 20090276011; 20090276012; 20090280153; 20090326605; 20100003656; 20100004705; 20100004717; 20100057159; 20100063563; 20100106217; 20100114190; 20100114192; 20100114193; 20100125219; 20100125304; 20100145428; 20100191304; 20100198098; 20100198296; 20100204749; 20100268288; 20100274303; 20100274308; 20100292602; 20110009920; 20110021899; 20110028799; 20110029038; 20110029044; 20110034912; 20110054569; 20110077721; 20110092800; 20110098778; 20110105998; 20110125203; 20110130615; 20110137381; 20110152967; 20110152988; 20110160795; 20110166430; 20110166546; 20110172554; 20110172725; 20110172732; 20110172739; 20110178441; 20110178442; 20110190569; 20110201944; 20110213222; 20110224602; 20110224749; 20110230701; 20110230938; 20110257517; 20110264182; 20110270095; 20110270096; 20110270346; 20110270347; 20110276107; 20110276112; 20110282225; 20110295344; 20110295345; 20110295346; 20110295347; 20110301529; 20110307030; 20110311489; 20110319975; 20120016336; 20120016432; 20120029591; 20120029601; 20120046711; 20120059431; 20120078323; 20120083700; 20120083701; 20120101326; 20120116741; 20120158092; 20120179228; 20120184801; 20120185020; 20120191158; 20120203079; 20120209346; 20120226130; 20120232327; 20120265262; 20120303080; 20120310050; 20120316622; 20120330369; 20130006332; 20130018438; 20130018439; 20130018440; 20130019325; 20130046358; 20130066350; 20130066392; 20130066395; 20130072996; 20130089503; 20130090454; 20130096441; 20130131753; 20130165846; 20130178913; 20130184639; 20130184792; 20130204144; 20130225953; 20130225992; 20130231721; 20130238049; 20130238050; 20130238053; 20130244323; 20130245464; 20130245486; 20130245711; 20130245712; 20130253612; 20130261703; 20130274625; 20130281890; 20130289653; 20130289669; 20130296406; 20130296637; 20130304159; 20130309278; 20130310909; 20130317580; 20130338450; 20140039290; 20140039336; 20140039578; 20140046203; 20140046407; 20140052213; 20140056815; 20140058189; 20140058292; 20140074188; 20140081071; 20140081353; 20140094720; 20140100633; 20140107397; 20140107398; 20140113367; 20140128938; 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Brain-To-Brain Interface (B2BI)—A B2BI is a direct communication pathway between the brain of one animal and the brain of another animal. Brain to brain interfaces have been used to help rats collaborate with each other.

It is hypothesized that by using brain-to-brain interfaces (BTBIs) a biological computer, or brain-net, could be constructed using animal brains as its computational units. Initial exploratory work demonstrated collaboration between rats in distant cages linked by signals from cortical microelectrode arrays implanted in their brains. The rats were rewarded when actions were performed by the “decoding rat” which conformed to incoming signals and when signals were transmitted by the “encoding rat” which resulted in the desired action. In the initial experiment the rewarded action was pushing a lever in the remote location corresponding to the position of a lever near a lighted LED at the home location. About a month was required for the rats to acclimate themselves to incoming “brainwaves.” When a decoding rat was unable to choose the correct lever, the encoding rat noticed (not getting an expected reward), and produced a round of task-related neuron firing that made the second rat more likely to choose the correct lever.

In another study, electrical brain readings were used to trigger a form of magnetic stimulation, to send a brain signal based on brain activity on a subject to a recipient, which caused the recipient to hit the fire button on a computer game.

Brain-To-Computer Interface (BCI)—BCI, sometimes called a neural-control interface (NCI), mind-machine interface (MMI), direct neural interface (DNI), or brain-machine interface (BMI), is a direct communication pathway between an enhanced or wired brain and an external device. BCI differs from neuromodulation in that it allows for bidirectional information flow. BCIs are often directed at researching, mapping, assisting, augmenting, or repairing human cognitive or sensory-motor functions.

Synthetic telepathy, also known as techlepathy or psychotronics(geeldon.wordpress.com2010/09/06/synthetic-telepathy-also-known-as-techlepathy-or-psychotronics), describes the process of use of brain-computer interfaces by which human thought (as electromagnetic radiation) is intercepted, processed by computer and a return signal generated that is perceptible by the human brain. Dewan, E. M., “Occipital Alpha Rhythm Eye Position and Lens Accommodation.” Nature 214, 975-977 (3 Jun. 1967), demonstrates the mental control of Alpha waves, turning them on and off, to produce Morse code representations of words and phrases by thought alone. U.S. Pat. No. 3,951,134 proposes remotely monitoring and altering brainwaves using radio, and references demodulating the waveform, displaying it to an operator for viewing and passing this to a computer for further analysis. In 1988, Farwell, L. A., & Donchin, E. (1988). Talking off the top of your head: toward a mental prosthesis utilizing event-related brain potentials. Electroencephalography and Clinical Neurophysiology, 70(6), 510-523 describes a method of transmitting linguistic information using the P300 response system, which combines matching observed information to what the subject was thinking of. In this case, being able to select a letter of the alphabet that the subject was thinking of. In theory, any input could be used and a lexicon constructed. U.S. Pat. No. 6,011,991 describes a method of monitoring an individual's brain waves remotely, for the purposes of communication, and outlines a system that monitors an individual's brainwaves via a sensor, then transmits this information, specifically by satellite, to a computer for analysis. This analysis would determine if the individual was attempting to communicate a “word, phrase, or thought corresponding to the matched stored normalized signal.”

Approaches to synthetic telepathy can be categorized into two major groups, passive and active. Like sonar, the receiver can take part or passively listen. Passive reception is the ability to “read” a signal without first broadcasting a signal. This can be roughly equated to tuning into a radio station—the brain generates electromagnetic radiation which can be received at a distance. That distance is determined by the sensitivity of the receiver, the filters used and the bandwidth required. Most universities would have limited budgets, and receivers, such as EEG (and similar devices), would be used. A related military technology is the surveillance system TEMPEST. Robert G. Malech's approach requires a modulated signal to be broadcast at the target. The method uses an active signal, which is interfered with by the brain's modulation. Thus, the return signal can be used to infer the original brainwave.

Computer mediation falls into two basic categories, interpretative and interactive. Interpretative mediation is the passive analysis of signals coming from the human brain. A computer “reads” the signal then compares that signal against a database of signals and their meanings. Using statistical analysis and repetition, false-positives are reduced over time. Interactive mediation can be in a passive-active mode or active-active mode. In this case, passive and active denote the method of reading and writing to the brain and whether or not they make use of a broadcast signal. Interactive mediation can also be performed manually or via artificial intelligence. Manual interactive mediation involves a human operator producing return signals such as speech or images. A.I. mediation leverages the cognitive system of the subject to identify images, pre-speech, objects, sounds and other artifacts, rather than developing A.I. routines to perform such activities. A.I. based systems may incorporate natural language processing interfaces that produce sensations, mental impressions, humor and conversation to provide a mental picture of a computerized personality. Statistical analysis and machine learning techniques, such as neural networks can be used.

ITV News Service, in March 1991, produced a report of ultrasound piggybacked on a commercial radio broadcast (100 MHz) aimed at entraining the brains of Iraqi troops and creating feelings of despair. U.S. Pat. No. 5,159,703 that refers to a “silent communications system in which nonaural carriers, in the very low or very high audio frequency range or in the adjacent ultrasonic frequency spectrum, are amplitude or frequency modulated with the desired intelligence and propagated acoustically or vibrationally, for inducement into the brain, typically through the use of loudspeakers, earphones or piezoelectrictransducers.” See:

-   Dr Nick Begich—Controlling the Human Mind, Earth Pulse Press     Anchorage—isbn=1-890693-54-5 -   cbcg.org/gjcs1.htm %7C God's Judgment Cometh Soon -   cnslab.ss.uci.edu/muri/research.html, #Dewan, #FarwellDonchin,     #ImaginedSpeechProduction, #Overview, MURI: Synthetic Telepathy -   daprocess.com/01.welcome.html DaProcess of A Federal Investigation -   deepthought.newsvine.com/_news2012/01/01/9865851-nsa-disinformation-watch-the-watchers-with-me -   deepthought.newsvine.com/_news2012/01/09/10074589-nsa-disinformation-watch-the-watchers-with-me-part-2 -   deepthought.newsvine.com/_news2012/01/16/10169491-the-nsa-behind-the-curtain -   genamason.wordpress.com/2009/10/18/more-on-synthetic-telepathy/ -   io9.com/5065304/tips-and-tricks-for-mind-control-from-the-us-military -   newdawnmagazine.com.au/Article/Brain_Zapping_Part_One.html -   pinktentade.com/2008/12/scientists-extract-images-directly-from-brain/Scientists     extract images directly from brain -   timesofindia.indiatimes.com/HealthSci/US_army_developing_synthetic_telepathy/ -   www.bibliotempleyades.net/ciencia/ciencia_nonlethalweapons02.htm     Eleanor White—New Devices That ‘Talk’ To The Human Mind Need Debate,     Controls -   www.cbsnews.com/stories/2008/12/31/60 minutes/main4694713.shtml 60     Minutes: Incredible Research Lets Scientists Get A Glimpse At Your     Thoughts -   www.cbsnews.com/video/watch/?id=5119805n&amp; tag=related;     photovideo 60 Minutes:Video—Mind Reading -   www.charlesrehn.com/charlesrehn/books/aconversationwithamerica/essays/myessays/The     % 20NSA.doc -   www.govtrack.us/congress/billtextxpd?bill=h107-2977 Space     Preservation Act of 2001 -   www.informaworld.com/smpp/content˜db=all˜content=a785359968 Partial     Amnesia for a Narrative Following Application of Theta Frequency     Electromagnetic Fields -   www.msnbc.msn.com/id/27162401/ -   www.psychology.nottingham.ac.uk/staff/Ipxdts/TMS % 20info.html     Transcranial Magnetic Stimulation -   www.raven1.net/silsoun2.htm Psy-Ops Weaponry Used In The Persian     Gulf War -   www.scribd.com/doc/24531011/Operation-Mind-Control -   www.scribd.com/doc/6508206/synthetic-telepathy-and-the-early-mind-wars -   www.slavery.org.uk/Bioeffects_of_Selected_Non-Lethal_Weapons.pdf—Bioeffects     of selected non-lethal weapons -   www.sst.ws/tempstandards.php?pab=1_1 TEMPEST measurement standards -   www.uwe.acuk/hlss/research/cpss/Journal_Psycho-Social_Studies/v2-2/SmithC.shtml     Journal of Psycho-Social Studies—Vol 2 (2)2003—On the Need for New     Criteria of Diagnosis of Psychosis in the Light of Mind Invasive     Technology by Dr. Carole Smith -   www.wired.com/dangerroom/2009/05/pentagon-preps-soldier-telepathy-push -   www.wired.com/wired/archive/7.11/persinger.html This Is Your Brain     on God -   Noah, Shachtman—Pentagon's PCs Bend to Your Brain     www.wired.com/dangerroom/2007/03/the_us_military -   Wall, Judy, “Military Use of Mind Control Weapons”, NEXUS, 5/06,     October-November 1998 -   Soldier-Telepathy” Drummond, Katie—Pentagon Preps Soldier Telepathy     Push U.S. Pat. Nos. 3,951,134; 5,159,703 Silent subliminal     presentation system; U.S. Pat. No. 6,587,729 Apparatus for audibly     communicating speech using the radio frequency hearing effect

It is known to analyze EEG patterns to extract an indication of certain volitional activity (U.S. Pat. No. 6,011,991). This technique describes that an EEG recording can be matched against a stored normalized signal using a computer. This matched signal is then translated into the corresponding reference. The patent application describes a method “a system capable of identifying particular nodes in an individual's brain, the firings of which affect characteristics such as appetite, hunger, thirst, communication skills” and “devices mounted to the person (e.g. underneath the scalp) may be energized in a predetermined manner or sequence to remotely cause particular identified brain node(s) to be fired in order to cause a predetermined feeling or reaction in the individual” without technical description of implementation. This patent also describes, that “brain activity [is monitored] by way of electroencephalograph (EEG) methods, magnetoencephalograph (MEG) methods, and the like. For example, see U.S. Pat. Nos. 5,816,247 and 5,325,862. See also, U.S. Patents and Pub. App. Nos. U.S. Pat. Nos. 3,951,134; 4,437,064; 4,591,787; 4,613,817; 4,689,559; 4,693,000; 4,700,135; 4,733,180; 4,736,751; 4,749,946; 4,753,246; 4,761,611; 4,771,239; 4,801,882; 4,862,359; 4,913,152; 4,937,525; 4,940,058; 4,947,480; 4,949,725; 4,951,674; 4,974,602; 4,982,157; 4,983,912; 4,996,479; 5,008,622; 5,012,190; 5,020,538; 5,061,680; 5,092,835; 5,095,270; 5,126,315; 5,158,932; 5,159,703; 5,159,928; 5,166,614; 5,187,327; 5,198,977; 5,213,338; 5,241,967; 5,243,281; 5,243,517; 5,263,488; 5,265,611; 5,269,325; 5,282,474; 5,283,523; 5,291,888; 5,303,705; 5,307,807; 5,309,095; 5,311,129; 5,323,777; 5,325,862; 5,326,745; 5,339,811; 5,417,211; 5,418,512; 5,442,289; 5,447,154; 5,458,142; 5,469,057; 5,476,438; 5,496,798; 5,513,649; 5,515,301; 5,552,375; 5,579,241; 5,594,849; 5,600,243; 5,601,081; 5,617,856; 5,626,145; 5,656,937; 5,671,740; 5,682,889; 5,701,909; 5,706,402; 5,706,811; 5,729,046; 5,743,854; 5,743,860; 5,752,514; 5,752,911; 5,755,227; 5,761,332; 5,762,611; 5,767,043; 5,771,261; 5,771,893; 5,771,894; 5,797,853; 5,813,993; 5,815,413; 5,842,986; 5,857,978; 5,885,976; 5,921,245; 5,938,598; 5,938,688; 5,970,499; 6,002,254; 6,011,991; 6,023,161; 6,066,084; 6,069,369; 6,080,164; 6,099,319; 6,144,872; 6,154,026; 6,155,966; 6,167,298; 6,167,311; 6,195,576; 6,230,037; 6,239,145; 6,263,189; 6,290,638; 6,354,087; 6,356,079; 6,370,414; 6,374,131; 6,385,479; 6,418,344; 6,442,948; 6,470,220; 6,488,617; 6,516,246; 6,526,415; 6,529,759; 6,538,436; 6,539,245; 6,539,263; 6,544,170; 6,547,746; 6,557,558; 6,587,729; 6,591,132; 6,609,030; 6,611,698; 6,648,822; 6,658,287; 6,665,552; 6,665,553; 6,665,562; 6,684,098; 6,687,525; 6,695,761; 6,697,660; 6,708,051; 6,708,064; 6,708,184; 6,725,080; 6,735,460; 6,774,929; 6,785,409; 6,795,724; 6,804,661; 6,815,949; 6,853,186; 6,856,830; 6,873,872; 6,876,196; 6,885,192; 6,907,280; 6,926,921; 6,947,790; 6,978,179; 6,980,863; 6,983,184; 6,983,264; 6,996,261; 7,022,083; 7,023,206; 7,024,247; 7,035,686; 7,038,450; 7,039,266; 7,039,547; 7,053,610; 7,062,391; 7,092,748; 7,105,824; 7,116,102; 7,120,486; 7,130,675; 7,145,333; 7,171,339; 7,176,680; 7,177,675; 7,183,381; 7,186,209; 7,187,169; 7,190,826; 7,193,413; 7,196,514; 7,197,352; 7,199,708; 7,209,787; 7,218,104; 7,222,964; 7,224,282; 7,228,178; 7,231,254; 7,242,984; 7,254,500; 7,258,659; 7,269,516; 7,277,758; 7,280,861; 7,286,871; 7,313,442; 7,324,851; 7,334,892; 7,338,171; 7,340,125; 7,340,289; 7,346,395; 7,353,064; 7,353,065; 7,369,896; 7,371,365; 7,376,459; 7,394,246; 7,400,984; 7,403,809; 7,403,820; 7,409,321; 7,418,290; 7,420,033; 7,437,196; 7,440,789; 7,453,263; 7,454,387; 7,457,653; 7,461,045; 7,462,155; 7,463,024; 7,466,132; 7,468,350; 7,482,298; 7,489,964; 7,502,720; 7,539,528; 7,539,543; 7,553,810; 7,565,200; 7,565,809; 7,567,693; 7,570,054; 7,573,264; 7,573,268; 7,580,798; 7,603,174; 7,608,579; 7,613,502; 7,613,519; 7,613,520; 7,620,456; 7,623,927; 7,623,928; 7,625,340; 7,627,370; 7,647,098; 7,649,351; 7,653,433; 7,672,707; 7,676,263; 7,678,767; 7,697,979; 7,706,871; 7,715,894; 7,720,519; 7,729,740; 7,729,773; 7,733,973; 7,734,340; 7,737,687; 7,742,820; 7,746,979; 7,747,325; 7,747,326; 7,747,551; 7,756,564; 7,763,588; 7,769,424; 7,771,341; 7,792,575; 7,800,493; 7,801,591; 7,801,686; 7,831,305; 7,834,627; 7,835,787; 7,840,039; 7,840,248; 7,840,250; 7,853,329; 7,856,264; 7,860,552; 7,873,411; 7,881,760; 7,881,770; 7,882,135; 7,891,814; 7,892,764; 7,894,903; 7,895,033; 7,904,139; 7,904,507; 7,908,009; 7,912,530; 7,917,221; 7,917,225; 7,929,693; 7,930,035; 7,932,225; 7,933,727; 7,937,152; 7,945,304; 7,962,204; 7,974,787; 7,986,991; 7,988,969; 8,000,767; 8,000,794; 8,001,179; 8,005,894; 8,010,178; 8,014,870; 8,027,730; 8,029,553; 8,032,209; 8,036,736; 8,055,591; 8,059,879; 8,065,360; 8,069,125; 8,073,631; 8,082,215; 8,083,786; 8,086,563; 8,116,874; 8,116,877; 8,121,694; 8,121,695; 8,150,523; 8,150,796; 8,155,726; 8,160,273; 8,185,382; 8,190,248; 8,190,264; 8,195,593; 8,209,224; 8,212,556; 8,222,378; 8,224,433; 8,229,540; 8,239,029; 8,244,552; 8,244,553; 8,248,069; 8,249,316; 8,270,814; 8,280,514; 8,285,351; 8,290,596; 8,295,934; 8,301,222; 8,301,257; 8,303,636; 8,304,246; 8,305,078; 8,308,646; 8,315,703; 8,334,690; 8,335,715; 8,335,716; 8,337,404; 8,343,066; 8,346,331; 8,350,804; 8,354,438; 8,356,004; 8,364,271; 8,374,412; 8,374,696; 8,380,314; 8,380,316; 8,380,658; 8,386,312; 8,386,313; 8,388,530; 8,392,250; 8,392,251; 8,392,253; 8,392,254; 8,392,255; 8,396,545; 8,396,546; 8,396,744; 8,401,655; 8,406,838; 8,406,848; 8,412,337; 8,423,144; 8,423,297; 8,429,225; 8,431,537; 8,433,388; 8,433,414; 8,433,418; 8,439,845; 8,444,571; 8,445,021; 8,447,407; 8,456,164; 8,457,730; 8,463,374; 8,463,378; 8,463,386; 8,463,387; 8,464,288; 8,467,878; 8,473,345; 8,483,795; 8,484,081; 8,487,760; 8,492,336; 8,494,610; 8,494,857; 8,494,905; 8,498,697; 8,509,904; 8,519,705; 8,527,029; 8,527,035; 8,529,463; 8,532,756; 8,532,757; 8,533,042; 8,538,513; 8,538,536; 8,543,199; 8,548,786; 8,548,852; 8,553,956; 8,554,325; 8,559,645; 8,562,540; 8,562,548; 8,565,606; 8,568,231; 8,571,629; 8,574,279; 8,586,019; 8,587,304; 8,588,933; 8,591,419; 8,593,141; 8,600,493; 8,600,696; 8,603,790; 8,606,592; 8,612,005; 8,613,695; 8,613,905; 8,614,254; 8,614,873; 8,615,293; 8,615,479; 8,615,664; 8,618,799; 8,626,264; 8,628,328; 8,635,105; 8,648,017; 8,652,189; 8,655,428; 8,655,437; 8,655,817; 8,658,149; 8,660,649; 8,666,099; 8,679,009; 8,682,441; 8,690,748; 8,693,765; 8,700,167; 8,703,114; 8,706,205; 8,706,206; 8,706,241; 8,706,518; 8,712,512; 8,716,447; 8,721,695; 8,725,243; 8,725,668; 8,725,669; 8,725,796; 8,731,650; 8,733,290; 8,738,395; 8,762,065; 8,762,202; 8,768,427; 8,768,447; 8,781,197; 8,781,597; 8,786,624; 8,798,717; 8,814,923; 8,815,582; 8,825,167; 8,838,225; 8,838,247; 8,845,545; 8,849,390; 8,849,392; 8,855,775; 8,858,440; 8,868,173; 8,874,439; 8,888,702; 8,893,120; 8,903,494; 8,907,668; 8,914,119; 8,918,176; 8,922,376; 8,933,696; 8,934,965; 8,938,289; 8,948,849; 8,951,189; 8,951,192; 8,954,293; 8,955,010; 8,961,187; 8,974,365; 8,977,024; 8,977,110; 8,977,362; 8,993,623; 9,002,458; 9,014,811; 9,015,087; 9,020,576; 9,026,194; 9,026,218; 9,026,372; 9,031,658; 9,034,055; 9,034,923; 9,037,224; 9,042,074; 9,042,201; 9,042,988; 9,044,188; 9,053,516; 9,063,183; 9,064,036; 9,069,031; 9,072,482; 9,074,976; 9,079,940; 9,081,890; 9,095,266; 9,095,303; 9,095,618; 9,101,263; 9,101,276; 9,102,717; 9,113,801; 9,113,803; 9,116,201; 9,125,581; 9,125,788; 9,138,156; 9,142,185; 9,155,373; 9,161,715; 9,167,979; 9,173,609; 9,179,854; 9,179,875; 9,183,351; 9,192,300; 9,198,621; 9,198,707; 9,204,835; 9,211,076; 9,211,077; 9,213,074; 9,229,080; 9,230,539; 9,233,244; 9,238,150; 9,241,665; 9,242,067; 9,247,890; 9,247,911; 9,248,003; 9,248,288; 9,249,200; 9,249,234; 9,251,566; 9,254,097; 9,254,383; 9,259,482; 9,259,591; 9,261,573; 9,265,943; 9,265,965; 9,271,679; 9,280,784; 9,283,279; 9,284,353; 9,285,249; 9,289,595; 9,302,069; 9,309,296; 9,320,900; 9,329,758; 9,331,841; 9,332,939; 9,333,334; 9,336,535; 9,336,611; 9,339,227; 9,345,609; 9,351,651; 9,357,240; 9,357,298; 9,357,970; 9,358,393; 9,359,449; 9,364,462; 9,365,628; 9,367,738; 9,368,018; 9,370,309; 9,370,667; 9,375,573; 9,377,348; 9,377,515; 9,381,352; 9,383,208; 9,392,955; 9,394,347; 9,395,425; 9,396,669; 9,401,033; 9,402,558; 9,403,038; 9,405,366; 9,410,885; 9,411,033; 9,412,233; 9,415,222; 9,418,368; 9,421,373; 9,427,474; 9,438,650; 9,440,070; 9,445,730; 9,446,238; 9,448,289; 9,451,734; 9,451,899; 9,458,208; 9,460,400; 9,462,733; 9,463,327; 9,468,541; 9,471,978; 9,474,852; 9,480,845; 9,480,854; 9,483,117; 9,486,381; 9,486,389; 9,486,618; 9,486,632; 9,492,114; 9,495,684; 9,497,017; 9,498,134; 9,498,634; 9,500,722; 9,505,817; 9,517,031; 9,517,222; 9,519,981; 9,521,958; 9,534,044; 9,538,635; 9,539,118; 9,556,487; 9,558,558; 9,560,458; 9,560,967; 9,560,984; 9,560,986; 9,563,950; 9,568,564; 9,572,996; 9,579,035; 9,579,048; 9,582,925; 9,584,928; 9,588,203; 9,588,490; 9,592,384; 9,600,138; 9,604,073; 9,612,295; 9,618,591; 9,622,660; 9,622,675; 9,630,008; 9,642,553; 9,642,554; 9,643,019; 9,646,248; 9,649,501; 9,655,573; 9,659,186; 9,664,856; 9,665,824; 9,665,987; 9,675,292; 9,681,814; 9,682,232; 9,684,051; 9,685,600; 9,687,562; 9,694,178; 9,694,197; 9,713,428; 9,713,433; 9,713,444; 9,713,712; D627476; RE44097; RE46209; 20010009975; 20020103428; 20020103429; 20020158631; 20020173714; 20030004429; 20030013981; 20030018277; 20030081818; 20030093004; 20030097159; 20030105408; 20030158495; 20030199749; 20040019370; 20040034299; 20040092809; 20040127803; 20040186542; 20040193037; 20040210127; 20040210156; 20040263162; 20050015205; 20050033154; 20050043774; 20050059874; 20050216071; 20050256378; 20050283053; 20060074822; 20060078183; 20060100526; 20060135880; 20060225437; 20070005391; 20070036355; 20070038067; 20070043392; 20070049844; 20070083128; 20070100251; 20070165915; 20070167723; 20070191704; 20070197930; 20070239059; 20080001600; 20080021340; 20080091118; 20080167571; 20080249430; 20080304731; 20090018432; 20090082688; 20090099783; 20090149736; 20090179642; 20090216288; 20090299169; 20090312624; 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Brain Entrainment—Brain entrainment, also referred to as brainwave synchronization and neural entrainment, refers to the capacity of the brain to naturally synchronize its brainwave frequencies with the rhythm of periodic external stimuli, most commonly auditory, visual, or tactile. Brainwave entrainment technologies are used to induce various brain states, such as relaxation or sleep, by creating stimuli that occur at regular, periodic intervals to mimic electrical cycles of the brain during the desired states, thereby “training” the brain to consciously alter states. Recurrent acoustic frequencies, flickering lights, or tactile vibrations are the most common examples of stimuli applied to generate different sensory responses. It is hypothesized that listening to these beats of certain frequencies one can induce a desired state of consciousness that corresponds with specific neural activity. Patterns of neural firing, measured in Hz, correspond with alertness states such as focused attention, deep sleep, etc.

Neural oscillations are rhythmic or repetitive electrochemical activity in the brain and central nervous system. Such oscillations can be characterized by their frequency, amplitude and phase. Neural tissue can generate oscillatory activity driven by mechanisms within individual neurons, as well as by interactions between them. They may also adjust frequency to synchronize with the periodic vibration of external acoustic or visual stimuli.

The term ‘entrainment’ has been used to describe a shared tendency of many physical and biological systems to synchronize their periodicity and rhythm through interaction. This tendency has been identified as specifically pertinent to the study of sound and music generally, and acoustic rhythms specifically. The most ubiquitous and familiar examples of neuromotor entrainment to acoustic stimuli is observable in spontaneous foot or finger tapping to the rhythmic beat of a song. Exogenous rhythmic entrainment, which occurs outside the body, has been identified and documented for a variety of human activities, which include the way people adjust the rhythm of their speech patterns to those of the subject with whom they communicate, and the rhythmic unison of an audience dapping. Even among groups of strangers, the rate of breathing, locomotive and subtle expressive motor movements, and rhythmic speech patterns have been observed to synchronize and entrain, in response to an auditory stimulus, such as a piece of music with a consistent rhythm. Furthermore, motor synchronization to repetitive tactile stimuli occurs in animals, including cats and monkeys as well as humans, with accompanying shifts in electroencephalogram (EEG) readings. Examples of endogenous entrainment, which occurs within the body, include the synchronizing of human circadian sleep-wake cycles to the 24-hour cycle of light and dark, and the frequency following response of humans to sounds and music.

Brainwaves, or neural oscillations, share the fundamental constituents with acoustic and optical waves, including frequency, amplitude and periodicity. The synchronous electrical activity of cortical neural ensembles can synchronize in response to external acoustic or optical stimuli and also entrain or synchronize their frequency and phase to that of a specific stimulus. Brainwave entrainment is a colloquialism for such ‘neural entrainment’, which is a term used to denote the way in which the aggregate frequency of oscillations produced by the synchronous electrical activity in ensembles of cortical neurons can adjust to synchronize with the periodic vibration of an external stimuli, such as a sustained acoustic frequency perceived as pitch, a regularly repeating pattern of intermittent sounds, perceived as rhythm, or of a regularly rhythmically intermittent flashing light.

Changes in neural oscillations, demonstrable through electroencephalogram (EEG) measurements, are precipitated by listening to music, which can modulate autonomic arousal ergotropically and trophotropically, increasing and decreasing arousal respectively. Musical auditory stimulation has also been demonstrated to improve immune function, facilitate relaxation, improve mood, and contribute to the alleviation of stress.

The Frequency following response (FFR), also referred to as Frequency Following Potential (FFP), is a specific response to hearing sound and music, by which neural oscillations adjust their frequency to match the rhythm of auditory stimuli. The use of sound with intent to influence cortical brainwave frequency is called auditory driving, by which frequency of neural oscillation is ‘driven’ to entrain with that of the rhythm of a sound source.

See, en.wikipedia.org/wiki/Brainwave_entrainment;

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A baseline correction of event-related time-frequency measure may be made to take pre-event baseline activity into consideration. In general, a baseline period is defined by the average of the values within a time window preceding the time-locking event. There are at least four common methods for baseline correction in time-frequency analysis. The methods include various baseline value normalizations. See,

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The question of whether different emotional states are associated with specific patterns of physiological response has long being a subject of neuroscience research See, for example:

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Some studies have indicated that the physiological correlates of emotions are likely to be found in the central nervous system (CNS). See, for example:

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Electroencephalograms (EEG) and functional Magnetic Resonance Imaging, fMRI have been used to study specific brain activity associated with different emotional states. Mauss and Robinson, in their review paper, have indicated that “emotional state is likely to involve circuits rather than any brain region considered in isolation” (Mauss I B, Robinson M D (2009) Measures of emotion: A review Cogn Emot 23: 209-237.)

The amplitude, latency from the stimulus, and covariance (in the case of multiple electrode sites) of each component can be examined in connection with a cognitive task (ERP) or with no task (EP). Steady-state visually evoked potentials (SSVEPs) use a continuous sinusoidally-modulated flickering light, typically superimposed in front of a TV monitor displaying a cognitive task. The brain response in a narrow frequency band containing the stimulus frequency is measured. Magnitude, phase, and coherence (in the case of multiple electrode sites) may be related to different parts of the cognitive task. Brain entrainment may be detected through EEG or MEG activity.

Brain entrainment may be detected through EEG or MEG activity. See:

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The entrainment hypothesis (Thut and Miniussi, 2009; Thut et al., 2011a, 2012), suggests the possibility of inducing a particular oscillation frequency in the brain using an external oscillatory force (e.g., rTMS, but also tACS). The physiological basis of oscillatory cortical activity lies in the timing of the interacting neurons; when groups of neurons synchronize their firing activities, brain rhythms emerge, network oscillations are generated, and the basis for interactions between brain areas may develop (Buzsnki, 2006). Because of the variety of experimental protocols for brain stimulation, limits on descriptions of the actual protocols employed, and limited controls, consistency of reported studies is lacking, and extrapolability is limited. Thus, while there is various consensus in various aspects of the effects of extra cranial brain stimulation, the results achieved have a degree of uncertainty dependent on details of implementation. On the other hand, within a specific experimental protocol, it is possible to obtain statistically significant and repeatable results. This implies that feedback control might be effective to control implementation of the stimulation for a given purpose; however, studies that employ feedback control are lacking.

Different cognitive states are associated with different oscillatory patterns in the brain (Buzsàki, 2006; Canolty and Knight, 2010; Varela et al., 2001). Thut et al. (2011b) directly tested the entrainment hypothesis by means of a concurrent EEG-TMS experiment. They first determined the individual source of the parietal-occipital alpha modulation and the individual alpha frequency (magnetoencephalography study). They then applied rTMS at the individual alpha power while recording the EEG activity at rest. The results confirmed the three predictions of the entrainment hypothesis: the induction of a specific frequency after TMS, the enhancement of oscillation during TMS stimulation due to synchronization, and a phase alignment of the induced frequency and the ongoing activity (Thut et al., 2011b).

If associative stimulation is a general principle for human neural plasticity in which the timing and strength of activation are critical factors, it is possible that synchronization within or between areas using an external force to phase/align oscillations can also favor efficient communication and associative plasticity (or alter communication). In this respect associative, cortico-cortical stimulation has been shown to enhance coherence of oscillatory activity between the stimulated areas (Plewnia et al., 2008).

In coherence resonance (Longtin, 1997), the addition of a certain amount of noise in an excitable system results in the most coherent and proficient oscillatory responses. The brain's response to external timing-embedded stimulation can result in a decrease in phase variance and an enhanced alignment (clustering) of the phase components of the ongoing EEG activity (entraining, phase resetting) that can change the signal-to-noise ratio and increase (or decrease) signal efficacy.

If one considers neuron activity within the brain as a set of loosely coupled oscillators, then the various parameters that might be controlled include the size of the region of neurons, frequency of oscillation, resonant frequency or time-constant, oscillator clamping, noise, amplitude, coupling to other oscillators, and of course, external influences that may include stimulation and/or power loss. In a human brain, pharmacological intervention may be significant. For example, drugs that alter excitability, such as caffeine, neurotransmitter release and reuptake, nerve conductance, etc. can all influence operation of the neural oscillators. Likewise, sub-threshold external stimulation effects, including DC, AC and magnetic electromagnetic effects, can also influence operation of the neural oscillators.

Phase resetting or shifting can synchronize inputs and favor communication and, eventually, Hebbian plasticity (Hebb, 1949). Thus, rhythmic stimulation may induce a statistically higher degree of coherence in spiking neurons, which facilitates the induction of a specific cognitive process (or hinders that process). Here, the perspective is slightly different (coherence resonance), but the underlining mechanisms are similar to the ones described so far (stochastic resonance), and the additional key factor is the repetition at a specific rhythm of the stimulation.

In the 1970's, the British biophysicist and psychobiologist, C. Maxwell Cade, monitored the brainwave patterns of advanced meditators and 300 of his students. Here he found that the most advanced meditators have a specific brainwave pattern that was different from the rest of his students. He noted that these meditators showed high activity of alpha brainwaves accompanied by beta, theta and even delta waves that were about half the amplitude of the alpha waves. See, Cade “The Awakened Mind: Biofeedback and the Development of Higher States of Awareness” (Dell, 1979). Anna Wise extended Cade's studies, and found that extraordinary achievers which included composers, inventors, artists, athletes, dancers, scientists, mathematicians, CEO's and presidents of large corporations have brainwave patterns differ from average performers, with a specific balance between Beta, Alpha, Theta and Delta brainwaves where Alpha had the strongest amplitude. See, Anna Wise, “The High-Performance Mind: Mastering Brainwaves for Insight, Healing, and Creativity”.

Entrainment is plausible because of the characteristics of the demonstrated EEG responses to a single TMS pulse, which have a spectral composition which resemble the spontaneous oscillations of the stimulated cortex. For example, TMS of the “resting” visual (Rosanova et al., 2009) or motor cortices (Veniero et al., 2011) triggers alpha-waves, the natural frequency at the resting state of both types of cortices. With the entrainment hypothesis, the noise generation framework moves to a more complex and extended level in which noise is synchronized with on-going activity. Nevertheless, the model to explain the outcome will not change, stimulation will interact with the system, and the final result will depend on introducing or modifying the noise level. The entrainment hypothesis makes clear predictions with respect to online repetitive TMS paradigms' frequency engagement as well as the possibility of inducing phase alignment, i.e., a reset of ongoing brain oscillations via external spTMS (Thut et al., 2011a, 2012; Veniero et al., 2011). The entrainment hypothesis is superior to the localization approach in gaining knowledge about how the brain works, rather than where or when a single process occurs. TMS pulses may phase-align the natural, ongoing oscillation of the target cortex. When additional TMS pulses are delivered in synchrony with the phase-aligned oscillation (i.e., at the same frequency), further synchronized phase-alignment will occur, which will bring the oscillation of the target area in resonance with the TMS train. Thus, entrainment may be expected when TMS is frequency-tuned to the underlying brain oscillations (Veniero et al., 2011).

Binaural Beats—Binaural beats are auditory brainstem responses which originate in the superior olivary nucleus of each hemisphere. They result from the interaction of two different auditory impulses, originating in opposite ears, below 1000 Hz and which differ in frequency between one and 30 Hz. For example, if a pure tone of 400 Hz is presented to the right ear and a pure tone of 410 Hz is presented simultaneously to the left ear, an amplitude modulated standing wave of 10 Hz, the difference between the two tones, is experienced as the two wave forms mesh in and out of phase within the superior olivary nuclei. This binaural beat is not heard in the ordinary sense of the word (the human range of hearing is from 20-20,000 Hz). It is perceived as an auditory beat and theoretically can be used to entrain specific neural rhythms through the frequency-following response (FFR)—the tendency for cortical potentials to entrain to or resonate at the frequency of an external stimulus. Thus, it is theoretically possible to utilize a specific binaural-beat frequency as a consciousness management technique to entrain a specific ortical rhythm. The binaural-beat appears to be associated with an electroencephalographic(EEG) frequency-following response in the brain.

Uses of audio with embedded binaural beats that are mixed with music or various pink or background sound are diverse. They range from relaxation, meditation, stress reduction, pain management, improved sleep quality, decrease in sleep requirements, super learning, enhanced creativity and intuition, remote viewing, telepathy, and out-of-body experience and lucid dreaming. Audio embedded with binaural beats is often combined with various meditation techniques, as well as positive affirmations and visualization.

When signals of two different frequencies are presented, one to each ear, the brain detects phase differences between these signals. Under natural circumstances a detected phase difference would provide directional information. The brain processes this anomalous information differently when these phase differences are heard with stereo headphones or speakers. A perceptual integration of the two signals takes place, producing the sensation of a third “beat” frequency. The difference between the signals waxes and wanes as the two different input frequencies mesh in and out of phase. As a result of these constantly increasing and decreasing differences, an amplitude-modulated standing wave—the binaural beat—is heard. The binaural beat is perceived as a fluctuating rhythm at the frequency of the difference between the two auditory inputs. Evidence suggests that the binaural beats are generated in the brainstem's superior olivary nucleus, the first site of contralateral integration in the auditory system. Studies also suggest that the frequency-following response originates from the inferior colliculus. This activity is conducted to the cortex where it can be recorded by scalp electrodes. Binaural beats can easily be heard at the low frequencies (<30 Hz) that are characteristic of the EEG spectrum.

Synchronized brain waves have long been associated with meditative and hypnogogic states, and audio with embedded binaural beats has the ability to induce and improve such states of consciousness. The reason for this is physiological. Each ear is “hardwired” (so to speak) to both hemispheres of the brain. Each hemisphere has its own olivary nucleus (sound-processing center) which receives signals from each ear. In keeping with this physiological structure, when a binaural beat is perceived there are actually two standing waves of equal amplitude and frequency present, one in each hemisphere. So, there are two separate standing waves entraining portions of each hemisphere to the same frequency. The binaural beats appear to contribute to the hemispheric synchronization evidenced in meditative and hypnogogic states of consciousness. Brain function is also enhanced through the increase of cross-collosal communication between the left and right hemispheres of the brain.

-   en.wikipedia.org/wiki/Beat_(acoustics)#Binaural beats. -   Oster, G (October 1973). “Auditory beats in the brain”. Scientific     American. 229 (4): 94-102. See: -   Lane, J. D., Kasian, S. J., Owens, J. E., & Marsh, G. R. (1998).     Binaural auditory beats affect vigilance performance and mood.     Physiology & behavior, 63(2), 249-252; -   Foster, D. S. (1990). EEG and subjective correlates of alpha     frequency binaural beats stimulation combined with alpha biofeedback     (Doctoral dissertation, Memphis State University); -   Kasprzak, C. (2011). Influence of binaural beats on EEG signal. Acta     Physical Polonica A, 119(6A), 986-990; -   Pratt, H., Starr, A., Michalewski, H. J., Dimitrijevic, A., Bleich,     N., & Mittelman, N. (2009). Cortical evoked potentials to an     auditory illusion: binaural beats. Clinical Neurophysiology, 120(8),     1514-1524; -   Pratt, H., Starr, A., Michalewski, H. J., Dimitrijevic, A., Bleich,     N., & Mittelman, N. (2010). A comparison of auditory evoked     potentials to acoustic beats and to binaural beats. Hearing     research, 262(1), 34-44; -   Padmanabhan, R., Hildreth, A. J., & Laws, D. (2005). A prospective,     randomised, controlled study examining binaural beat audio and     pre-operative anxiety in patients undergoing general anaesthesia for     day case surgery. Anaesthesia, 60(9), 874-877; -   Reedijk, S. A., Bolders, A., & Hommel, B. (2013). The impact of     binaural beats on creativity. Front. in human neuroscience, 7; -   Atwater, F. H. (2001). Binaural beats and the regulation of arousal     levels. Proceedings of the TANS, 11; -   Hink, R. F., Kodera, K., Yamada, O, Kaga, K., & Suzuki, J. (1980).     Binaural interaction of a beating frequency-following response.     Audiology, 19(1), 36-43; -   Gao, X., Cao, H., Ming, D., Qi, H., Wang, X., Wang, X., & Zhou, P.     (2014). Analysis of EEG activity in response to binaural beats with     different frequencies. International Journal of Psychophysiology,     94(3), 399-406; -   Sung, H. C., Lee, W. L., Li, H. M., Lin, C. Y., Wu, Y. Z., Wang, J.     J., & Li, T. L. (2017). Familiar Music Listening with Binaural Beats     for Older People with Depressive Symptoms in Retirement Homes.     Neuropsychiatry, 7(4); -   Colzato, L. S., Barone, H., Sellaro, R., & Hommel, B. (2017). More     attentional focusing through binaural beats: evidence from the     global-local task. Psychological research, 81(1), 271-277; -   Mortazavi, S. M. J., Zahraei-Moghadam, S. M., Masoumi, S., Rafati,     A., Haghani, M., Mortazavi, S. A. R., & Zehtabian, M. (2017). Short     Term Exposure to Binaural Beats Adversely Affects Learning and     Memory in Rats. Journal of Biomedical Physics and Engineering. -   Brain Entrainment Frequency Following Response (or FFR). See,     “Stimulating the Brain with Light and Sound,” Transparent     Corporation, Neuroprogrammer™ 3,     www.transparentcorp.com/products/np/entrainment.php.

Isochronic Tones—Isochronictones are regular beats of a single tone that are used alongside monaural beats and binaural beats in the process called brainwave entrainment. At its simplest level, an isochronictone is a tone that is being turned on and off rapidly. They create sharp, distinctive pulses of sound.

-   www.livingflow.net/isochronic-tones-work/; -   Schulze, H. H. (1989). The perception of temporal deviations in     isochronic patterns. Attention, Perception, & Psychophysics, 45(4),     291-296; -   Oster, G. (1973). Auditory beats in the brain. Scientific American,     229(4), 94-102; -   Huang, T. L., & Charyton, C. (2008). A comprehensive review of the     psychological effects of brainwave entrainment. Alternative     therapies in health and medicine, 14(5), 38; -   Trost, W., Frühholz, S., Schön, D., Labbé, C., Pichon, S.,     Grandjean, D., & Vuilleumier, P. (2014). Getting the beat:     entrainment of brain activity by musical rhythm and pleasantness.     Neurol maga, 103, 55-64; -   Casciaro, F., Laterza, V., Conte, S., Pieralice, M., Federici, A.,     Todarello, O., . . . & Conte, E. (2013). Alpha-rhythm stimulation     using brain entrainment enhances heart rate variability in subjects     with reduced HRV. World Journal of Neuroscience, 3(04), 213; -   Conte, E., Conte, S., Santacroce, N., Federici, A., Todarello, O.,     Orsucci, F., . . . & Laterza, V. (2013). A Fast Fourier Transform     analysis of time series data of heart rate variability during     alfa-rhythm stimulation in brain entrainment. NeuroQuantology,     11(3); -   Doherty, C. (2014). A comparison of alpha brainwave entrainment,     with and without musical accompaniment; -   Moseley, R. (2015, July). Inducing targeted brain states utilizing     merged reality systems. In Science and Information Conference (SAI),     2015 (pp. 657-663). IEEE.

Time-Frequency Analysis—Brian J. Roach and Daniel H. Mathalon, “Event-related EEG time-frequency analysis: an overview of measures and analysis of early gamma band phase locking in schizophrenia. Schizophrenia Bull. USA. 2008; 34:5:907-926, describes a mechanism for EEG time-frequency analysis. Fourier and wavelet transforms (and their inverse) may be performed on EEG signals.

See, U.S. Patent and Pub. App. Nos. U.S. Pat. Nos. 4,407,299; 4,408,616; 4,421,122; 4,493,327; 4,550,736; 4,557,270; 4,579,125; 4,583,190; 4,585,011; 4,610,259; 4,649,482; 4,705,049; 4,736,307; 4,744,029; 4,776,345; 4,792,145; 4,794,533; 4,846,190; 4,862,359; 4,883,067; 4,907,597; 4,924,875; 4,940,058; 5,010,891; 5,020,540; 5,029,082; 5,083,571; 5,092,341; 5,105,354; 5,109,862; 5,218,530; 5,230,344; 5,230,346; 5,233,517; 5,241,967; 5,243,517; 5,269,315; 5,280,791; 5,287,859; 5,309,917; 5,309,923; 5,320,109; 5,339,811; 5,339,826; 5,377,100; 5,406,956; 5,406,957; 5,443,073; 5,447,166; 5,458,117; 5,474,082; 5,555,889; 5,611,350; 5,619,995; 5,632,272; 5,643,325; 5,678,561; 5,685,313; 5,692,517; 5,694,939; 5,699,808; 5,752,521; 5,755,739; 5,771,261; 5,771,897; 5,794,623; 5,795,304; 5,797,840; 5,810,737; 5,813,993; 5,827,195; 5,840,040; 5,846,189; 5,846,208; 5,853,005; 5,871,517; 5,884,626; 5,899,867; 5,916,171; 5,995,868; 6,002,952; 6,011,990; 6,016,444; 6,021,345; 6,032,072; 6,044,292; 6,050,940; 6,052,619; 6,067,462; 6,067,467; 6,070,098; 6,071,246; 6,081,735; 6,097,980; 6,097,981; 6,115,631; 6,117,075; 6,129,681; 6,155,993; 6,157,850; 6,157,857; 6,171,258; 6,195,576; 6,196,972; 6,224,549; 6,236,872; 6,287,328; 6,292,688; 6,293,904; 6,305,943; 6,306,077; 6,309,342; 6,315,736; 6,317,627; 6,325,761; 6,331,164; 6,338,713; 6,343,229; 6,358,201; 6,366,813; 6,370,423; 6,375,614; 6,377,833; 6,385,486; 6,394,963; 6,402,520; 6,475,163; 6,482,165; 6,493,577; 6,496,724; 6,511,424; 6,520,905; 6,520,921; 6,524,249; 6,527,730; 6,529,773; 6,544,170; 6,546,378; 6,547,736; 6,547,746; 6,549,804; 6,556,861; 6,565,518; 6,574,573; 6,594,524; 6,602,202; 6,616,611; 6,622,036; 6,625,485; 6,626,676; 6,650,917; 6,652,470; 6,654,632; 6,658,287; 6,678,548; 6,687,525; 6,699,194; 6,709,399; 6,726,624; 6,731,975; 6,735,467; 6,743,182; 6,745,060; 6,745,156; 6,746,409; 6,751,499; 6,768,920; 6,798,898; 6,801,803; 6,804,661; 6,816,744; 6,819,956; 6,826,426; 6,843,774; 6,865,494; 6,875,174; 6,882,881; 6,886,964; 6,915,241; 6,928,354; 6,931,274; 6,931,275; 6,981,947; 6,985,769; 6,988,056; 6,993,380; 7,011,410; 7,014,613; 7,016,722; 7,037,260; 7,043,293; 7,054,454; 7,089,927; 7,092,748; 7,099,714; 7,104,963; 7,105,824; 7,123,955; 7,128,713; 7,130,691; 7,146,218; 7,150,710; 7,150,715; 7,150,718; 7,163,512; 7,164,941; 7,177,675; 7,190,995; 7,207,948; 7,209,788; 7,215,986; 7,225,013; 7,228,169; 7,228,171; 7,231,245; 7,254,433; 7,254,439; 7,254,500; 7,267,652; 7,269,456; 7,286,871; 7,288,066; 7,297,110; 7,299,088; 7,324,845; 7,328,053; 7,333,619; 7,333,851; 7,343,198; 7,367,949; 7,373,198; 7,376,453; 7,381,185; 7,383,070; 7,392,079; 7,395,292; 7,396,333; 7,399,282; 7,403,814; 7,403,815; 7,418,290; 7,429,247; 7,450,986; 7,454,240; 7,462,151; 7,468,040; 7,469,697; 7,471,971; 7,471,978; 7,489,958; 7,489,964; 7,491,173; 7,496,393; 7,499,741; 7,499,745; 7,509,154; 7,509,161; 7,509,163; 7,510,531; 7,530,955; 7,537,568; 7,539,532; 7,539,533; 7,547,284; 7,558,622; 7,559,903; 7,570,991; 7,572,225; 7,574,007; 7,574,254; 7,593,767; 7,594,122; 7,596,535; 7,603,168; 7,604,603; 7,610,094; 7,623,912; 7,623,928; 7,625,340; 7,630,757; 7,640,055; 7,643,655; 7,647,098; 7,654,948; 7,668,579; 7,668,591; 7,672,717; 7,676,263; 7,678,061; 7,684,856; 7,697,979; 7,702,502; 7,706,871; 7,706,992; 7,711,417; 7,715,910; 7,720,530; 7,727,161; 7,729,753; 7,733,224; 7,734,334; 7,747,325; 7,751,878; 7,754,190; 7,757,690; 7,758,503; 7,764,987; 7,771,364; 7,774,052; 7,774,064; 7,778,693; 7,787,946; 7,794,406; 7,801,592; 7,801,593; 7,803,118; 7,803,119; 7,809,433; 7,811,279; 7,819,812; 7,831,302; 7,853,329; 7,860,561; 7,865,234; 7,865,235; 7,878,965; 7,879,043; 7,887,493; 7,894,890; 7,896,807; 7,899,525; 7,904,144; 7,907,994; 7,909,771; 7,918,779; 7,920,914; 7,930,035; 7,938,782; 7,938,785; 7,941,209; 7,942,824; 7,944,551; 7,962,204; 7,974,696; 7,983,741; 7,983,757; 7,986,991; 7,993,279; 7,996,075; 8,002,553; 8,005,534; 8,005,624; 8,010,347; 8,019,400; 8,019,410; 8,024,032; 8,025,404; 8,032,209; 8,033,996; 8,036,728; 8,036,736; 8,041,136; 8,046,041; 8,046,042; 8,065,011; 8,066,637; 8,066,647; 8,068,904; 8,073,534; 8,075,499; 8,079,953; 8,082,031; 8,086,294; 8,089,283; 8,095,210; 8,103,333; 8,108,036; 8,108,039; 8,114,021; 8,121,673; 8,126,528; 8,128,572; 8,131,354; 8,133,172; 8,137,269; 8,137,270; 8,145,310; 8,152,732; 8,155,736; 8,160,689; 8,172,766; 8,177,726; 8,177,727; 8,180,420; 8,180,601; 8,185,207; 8,187,201; 8,190,227; 8,190,249; 8,190,251; 8,197,395; 8,197,437; 8,200,319; 8,204,583; 8,211,035; 8,214,007; 8,224,433; 8,236,005; 8,239,014; 8,241,213; 8,244,340; 8,244,475; 8,249,698; 8,271,077; 8,280,502; 8,280,503; 8,280,514; 8,285,368; 8,290,575; 8,295,914; 8,296,108; 8,298,140; 8,301,232; 8,301,233; 8,306,610; 8,311,622; 8,314,707; 8,315,970; 8,320,649; 8,323,188; 8,323,189; 8,323,204; 8,328,718; 8,332,017; 8,332,024; 8,335,561; 8,337,404; 8,340,752; 8,340,753; 8,343,026; 8,346,342; 8,346,349; 8,352,023; 8,353,837; 8,354,881; 8,356,594; 8,359,080; 8,364,226; 8,364,254; 8,364,255; 8,369,940; 8,374,690; 8,374,703; 8,380,296; 8,382,667; 8,386,244; 8,391,966; 8,396,546; 8,396,557; 8,401,624; 8,401,626; 8,403,848; 8,425,415; 8,425,583; 8,428,696; 8,437,843; 8,437,844; 8,442,626; 8,449,471; 8,452,544; 8,454,555; 8,461,988; 8,463,007; 8,463,349; 8,463,370; 8,465,408; 8,467,877; 8,473,024; 8,473,044; 8,473,306; 8,475,354; 8,475,368; 8,475,387; 8,478,389; 8,478,394; 8,478,402; 8,480,554; 8,484,270; 8,494,829; 8,498,697; 8,500,282; 8,500,636; 8,509,885; 8,509,904; 8,512,221; 8,512,240; 8,515,535; 8,519,853; 8,521,284; 8,525,673; 8,525,687; 8,527,435; 8,531,291; 8,538,512; 8,538,514; 8,538,705; 8,542,900; 8,543,199; 8,543,219; 8,545,416; 8,545,436; 8,554,311; 8,554,325; 8,560,034; 8,560,073; 8,562,525; 8,562,526; 8,562,527; 8,562,951; 8,568,329; 8,571,642; 8,585,568; 8,588,933; 8,591,419; 8,591,498; 8,597,193; 8,600,502; 8,606,351; 8,606,356; 8,606,360; 8,620,419; 8,628,480; 8,630,699; 8,632,465; 8,632,750; 8,641,632; 8,644,914; 8,644,921; 8,647,278; 8,649,866; 8,652,038; 8,655,817; 8,657,756; 8,660,799; 8,666,467; 8,670,603; 8,672,852; 8,680,991; 8,684,900; 8,684,922; 8,684,926; 8,688,209; 8,690,748; 8,693,756; 8,694,087; 8,694,089; 8,694,107; 8,700,137; 8,700,141; 8,700,142; 8,706,205; 8,706,206; 8,706,207; 8,708,903; 8,712,507; 8,712,513; 8,725,238; 8,725,243; 8,725,311; 8,725,669; 8,727,978; 8,728,001; 8,738,121; 8,744,563; 8,747,313; 8,747,336; 8,750,971; 8,750,974; 8,750,992; 8,755,854; 8,755,856; 8,755,868; 8,755,869; 8,755,871; 8,761,866; 8,761,869; 8,764,651; 8,764,652; 8,764,653; 8,768,447; 8,771,194; 8,775,340; 8,781,193; 8,781,563; 8,781,595; 8,781,597; 8,784,322; 8,786,624; 8,790,255; 8,790,272; 8,792,974; 8,798,735; 8,798,736; 8,801,620; 8,821,408; 8,825,149; 8,825,428; 8,827,917; 8,831,705; 8,838,226; 8,838,227; 8,843,199; 8,843,210; 8,849,390; 8,849,392; 8,849,681; 8,852,100; 8,852,103; 8,855,758; 8,858,440; 8,858,449; 8,862,196; 8,862,210; 8,862,581; 8,868,148; 8,868,163; 8,868,172; 8,868,174; 8,868,175; 8,870,737; 8,880,207; 8,880,576; 8,886,299; 8,888,672; 8,888,673; 8,888,702; 8,888,708; 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There are many approaches to time-frequency decomposition of EEG data, including the short-term Fourier transform (SIFT), (Gabor D. Theory of Communication. J. Inst. Electr. Engrs. 1946; 93:429-457) continuous (Daubechies I. Ten Lectures on Wavelets. Philadelphia, Pa.: Society for Industrial and Applied Mathematics; 1992:357.21. Combes J M, Grossmann A, Tchamitchian P. Wavelets: Time-Frequency Methods and Phase Space-Proceedings of the International Conference; Dec. 14-18, 1987; Marseille, France) or discrete (Mallet S G. A theory for multiresolution signal decomposition: the wavelet representation. IEEE Trans Pattern Anal Mach Intell. 1989; 11:674-693) wavelet transforms, Hilbert transform (Lyons R G. Understanding Digital Signal Processing. 2nd ed. Upper Saddle River, N.J.: Prentice Hall PTR; 2004:688), and matching pursuits (Mallat S, Zhang Z. Matching pursuits with time-frequency dictionaries. IEEE Trans. Signal Proc. 1993; 41(12):3397-3415). Prototype analysis systems may be implemented using, for example, MatLab with the Wavelet Toolbox, www.mathworks.com/products/wavelet.html.

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8,494,829; 8,494,905; 8,498,699; 8,509,881; 8,533,042; 8,548,786; 8,571,629; 8,579,786; 8,591,419; 8,606,360; 8,628,480; 8,655,428; 8,666,478; 8,682,422; 8,706,183; 8,706,205; 8,718,747; 8,725,238; 8,738,136; 8,747,382; 8,755,877; 8,761,869; 8,762,202; 8,768,449; 8,781,796; 8,790,255; 8,790,272; 8,821,408; 8,825,149; 8,831,731; 8,843,210; 8,849,392; 8,849,632; 8,855,773; 8,858,440; 8,862,210; 8,862,581; 8,903,479; 8,918,178; 8,934,965; 8,951,190; 8,954,139; 8,955,010; 8,958,868; 8,983,628; 8,983,629; 8,989,835; 9,020,789; 9,026,217; 9,031,644; 9,050,470; 9,060,671; 9,070,492; 9,072,832; 9,072,905; 9,078,584; 9,084,896; 9,095,295; 9,101,276; 9,107,595; 9,116,835; 9,125,574; 9,149,719; 9,155,487; 9,192,309; 9,198,621; 9,204,835; 9,211,417; 9,215,978; 9,232,910; 9,232,984; 9,238,142; 9,242,067; 9,247,911; 9,248,286; 9,254,383; 9,277,871; 9,277,873; 9,282,934; 9,289,603; 9,302,110; 9,307,944; 9,308,372; 9,320,450; 9,336,535; 9,357,941; 9,375,151; 9,375,171; 9,375,571; 9,403,038; 9,415,219; 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Single instruction, multiple data processors, such as graphic processing units including the nVidia CUDA environment or AMD Firepro high-performance computing environment are known, and may be employed for general purpose computing, finding particular application in data matrix transformations.

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Statistical analysis may be presented in a form that permits parallelization, which can be efficiently implemented using various parallel processors, a common form of which is a SIMD (single instruction, multiple data) processor, found in typical graphics processors (GPUs).

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Artificial neural networks have been employed to analyze EEG signals.

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SUMMARY AND OBJECTS OF THE INVENTION

The present invention generally relates to enhancing and/or accelerating learning or performance of a mental or motor task, and/or enhanced assimilation and retention of information by a subject (e.g., a student) by conveying to the brain of the subject patterns of brainwaves. These brainwaves may be artificial or synthetic, or derived from the brain of a second subject (e.g., a teacher, a trainer, a mentor, a master or person skill and/or knowledgeable in the given task). Typically, the wave patterns of the second subject are derived while the second subject is performing a physical or mental task, e.g., corresponding to the task sought to be learned or performed by the transferee subject.

A special case is where the first and second subjects are the same. For example, brainwave patters are recorded while a subject is learning a task or information. That same pattern my assist in further learning of similar tasks, and/or recall of the previous learning. Also the same pattern may assist in performance of a mental or a motor task previously learnt. Thus, there may be a time delay between acquisition of the brainwave information from the second subject, and exposing the first subject to corresponding stimulation. The signals may be recorded and transmitted.

The temporal pattern may be conveyed or induced non-invasively via light, sound (or ultrasound), transcranial direct current stimulation (tDCS), transcranial magnetic stimulation (TMS), or any other means capable of conveying frequency patterns. In a preferred embodiment, normal human senses are employed to stimulate the subject, such as light, sound, and touch.

This technology may be advantageously used to accelerate learning, or enhance performance, of a new mental skill or task, a new motor skill or task. Still another aspect provides enhanced processing, comprehension, and retention of new information. The technology may be used in humans or animals.

The present technology may employ an event-correlated EEG time and/or frequency analysis performed on neuronal activity patterns. In a time analysis, the signal is analyzed temporally and spatially, generally looking for changes with respect to time and space. In a frequency analysis, over an epoch of analysis, the data, which is typically a time-sequence of samples, is transformed, using e.g., a Fourier transform (FT, or one implementation, the Fast Fourier Transform, FFT), into a frequency domain representation, and the frequencies present during the epoch are analyzed. The window of analysis may be rolling, and so the frequency analysis may be continuous. In a hybrid time-frequency analysis, for example, a wavelet analysis, the data during the epoch is transformed using a “wavelet transform”, e.g., the Discrete Wavelet Transform (DWT) or continuous wavelet transform (CWT), which has the ability to construct a time-frequency representation of a signal that offers very good time and frequency localization. Changes in transformed data over time and space may be analyzed. In general, the spatial aspect of the brainwave analysis is anatomically modelled. In most cases, anatomy is considered universal, but in some cases, there are significant differences. For example, brain injury, psychiatric disease, age, race, native language, training, sex, handedness, and other factors may lead to distinct spatial arrangement of brain function, and therefore when transferring activity from one individual to another, it is preferred to normalize the brain anatomy of both individuals by performing standard tasks/tests, and measuring spatial parameters of the EEG or MEG. Note that spatial organization of the brain is highly persistent, absent injury or disease, and therefore this need only be performed infrequently. However, since electrode placement may be inexact, a spatial calibration may be performed after electrode placement.

Different aspects of EEG magnitude and phase relationships may be captured, to reveal details of the neuronal activity. The “time-frequency analysis” reveals the brain's parallel processing of information, with oscillations at various frequencies within various regions of the brain reflecting multiple neural processes co-occurring and interacting. See, Lisman J, Buzsaki G. A neural coding scheme formed by the combined function of gamma and theta oscillations. Schizophr Bull. Jun. 16, 2008; doi:10.1093/schbul/sbn060. Such a time-frequency analysis may take the form of a wavelet transform analysis. This may be used to assist in integrative and dynamically adaptive information processing. Of course, the transform may be essentially lossless and may be performed in any convenient information domain representation. These EEG-based data analyses reveal the frequency-specific neuronal oscillations and their synchronization in brain functions ranging from sensory processing to higher-order cognition. Therefore, these patterns may be selectively analyzed, for transfer to or induction in, a subject.

A statistical clustering analysis may be performed in high dimension space to isolate or segment regions which act as signal sources, and to characterize the coupling between various regions. This analysis may also be used to establish signal types within each brain region, and decision boundaries characterizing transitions between different signal types. These transitions may be state dependent, and therefore the transitions may be detected based on a temporal analysis, rather than merely a concurrent oscillator state.

The various measures make use of the magnitude and/or phase angle information derived from the complex data extracted from the EEG during spectral decomposition and/or temporal/spatial/spectralanalysis. Some measures estimate the magnitude or phase consistency of the EEG within one channel across trials, whereas others estimate the consistency of the magnitude or phase differences between channels across trials. Beyond these two families of calculations, there are also measures that examine the coupling between frequencies, within trials and recording sites. Of course, in the realm of time-frequency analysis, many types of relationships can be examined beyond those already mentioned.

These sensory processing specific neuronal oscillations, e.g., brainwave patterns, e.g., of a trainer or a skilled person, are closely connected to the task or the skill the person is engaged with (movements, coordination, learning, thoughts, emotions, moods, biological chemistry, etc.), and can be stored on a tangible medium and/or can be simultaneously conveyed to a trainee making use of the brain's frequency following response nature. See, Galbraith, Gary C., Darlene M. Olfman, and Todd M. Huffman. “Selective attention affects human brain stem frequency-following response.” Neuroreport 14, no. 5 (2003): 735-738, journals.|ww.com/neuroreport/Abstract/2003/04150/Selective_attention_affects_human_brain_stem.15.aspx.

One of the advantages of transforming the data is the ability to select a transform that separates the information of interest represented in the raw data, from noise or other information. Some transforms preserve the spatial and state transition history, and may be used for a more global analysis. Another advantage of a transform is that it can present the information of interest in a form where relatively simple linear or statistical functions of low order may be applied. In some cases, it is desired to perform an inverse transform on the data. For example, if the raw data includes noise, such as 50 or 60 Hz interference, a frequency transform may be performed, followed by a narrow band filtering of the interference and its higher order intermodulation products. An inverse transform may be performed to return the data to its time-domain representation for further processing. (In the case of simple filtering, a finite impulse response (FIR) or infinite impulse response (IIR) filter could be employed). In other cases, the analysis is continued in the transformed domain.

Transforms may be part of an efficient algorithm to compress data for storage or analysis, by making the representation of the information of interest consume fewer bits of information (if in digital form) and/or allow it to be communication using lower bandwidth. Typically, compression algorithms will not be lossless, and as a result, the compression is irreversible with respect to truncated information.

Typically, the transformation(s) and filtering of the signal are conducted using traditional computer logic, according to defined algorithms. The intermediate stages may be stored and analyzed. However, in some cases, neural networks or deep neural networks may be used, convolutional neural network architectures, or even analog signal processing. According to one set of embodiments, the transforms (if any) and analysis are implemented in a parallel processing environment. Such as using an SIMD processor such as a GPU. Algorithms implemented in such systems are characterized by an avoidance of data-dependent branch instructions, with many threads concurrently executing the same instructions.

EEG signals are analyzed to determine the location (e.g., voxel or brain region) from which an electrical activity pattern is emitted, and the wave pattern characterized. The spatial processing of the EEG signals will typically precede the content analysis, since noise and artifacts may be useful for spatial resolution. Further, the signal from one brain region will typically be noise or interference in the signal analysis from another brain region; so the spatial analysis may represent part of the comprehension analysis. The spatial analysis is typically in the form of a geometrically and/or anatomically-constrained statistical model, employing all of the raw inputs in parallel. For example, where the input data is transcutaneous electroencephalogram information, from 32 EEG electrodes, the 32 input channels, sampled at e.g., 500 sps, 1 ksps or 2 ksps, are processed in a four or higher dimensional matrix, to permit mapping of locations and communication of impulses over time, space and state.

The matrix processing may be performed in a standard computing environment, e.g., an i7-7920HQ, i7-8700K, or i9-7980XE processor, under the Windows 10 operating system, executing Matlab (Mathworks, Woburn Mass.) software platform. Alternately, the matrix processing may be performed in a computer cluster or grid or cloud computing environment. The processing may also employ parallel processing, in either a distributed and loosely coupled environment, or asynchronous environment. One preferred embodiment employs a single instruction, multiple data processors, such as a graphics processing unit such as the nVidia CUDA environment or AMD Firepro high-performance computing environment.

Artificial intelligence (AI) and machine learning methods, such as artificial neural networks, deep neural networks, etc., may be implemented to extract the signals of interest. Neural networks act as an optimized statistical classifier and may have arbitrary complexity. A so-called deep neural network having multiple hidden layers may be employed. The processing is typically dependent on labeled training data, such as EEG data, or various processed, transformed, or classified representations of the EEG data. The label represents the task, performance, context, or state of the subject during acquisition. In order to handle the continuous stream of data represented by the EEG, a recurrent neural network architecture may be implemented. Depending preprocessing before the neural network, formal implementations of recurrence may be avoided. A four or more dimensional data matrix may be derived from the traditional spatial-temporal processing of the EEG and fed to a neural network. Since the time parameter is represented in the input data, a neural network temporal memory is not required, though this architecture may require a larger number of inputs. Principal component analysis (PCA, en.wikipedia.org/wiki/Principal_component_analysis), spatial PCA (arxiv.org/pdf/1501.03221v3.pdf, adegenet.r-forge.r-project/org/files/tutorial-spca.pdf, www.mbi.nlm.nih.gov/pubmed/1510870); and clustering analysis may also be employed (en.wikipedia.org/wiki/Cluster_analysis, see U.S. Pat. Nos. 9,336,302, 9,607,023 and cited references).

In general, a neural network of this type of implementation will, in operation, be able to receive unlabeled EEG data, and produce the output signals representative of the predicted or estimated task, performance, context, or state of the subject during acquisition of the unclassified EEG. Of course, statistical classifiers may be used rather than neural networks.

The analyzed EEG, either by conventional processing, neural network processing, or both, serves two purposes. First, it permits one to deduce which areas of the brain are subject to which kinds of electrical activity under which conditions. Second, it permits feedback during training of a trainee (assuming proper spatial and anatomical correlates between the trainer and trainee), to help the system achieve the desired state, or as may be appropriate, desired series of states and/or state transitions. According to one aspect of the technology, the applied stimulation is dependent on a measured starting state or status (which may represent a complex context and history dependent matrix of parameters), and therefore the target represents a desired complex vector change. Therefore, this aspect of the technology seeks to understand a complex time-space-brain activity associated with an activity or task in a trainer, and to seek a corresponding complex time-space-brain activity associated with the same activity or task in a trainee, such that the complex time-space-brain activity state in the trainor is distinct from the corresponding state sought to be achieved in the trainee. This permits transfer of training paradigms from qualitatively different persons, in different contexts, and, to some extent, to achieve a different result.

The conditions of data acquisition from the trainer will include both task data, and sensory-stimulation data. That is, a preferred application of the system is to acquire EEG data from a trainer or skilled individual, which will then be used to transfer learning, or more likely, learning readiness states, to a naïve trainee. The goal for the trainee is to produce a set of stimulation parameters that will achieve, in the trainee, the corresponding neural activity resulting in the EEG state of the trainer at the time of or preceding the learning of a skill or a task, or performance of the task.

It is noted that EEG is not the only neural or brain activity or state data that may be acquired, and of course any and all such data may be included within the scope of the technology, and therefore EEG is a representative example only of the types of data that may be used. Other types include fMRI, magnetoencephalogram, motor neuron activity, PET, etc.

While mapping the stimulus-response patterns distinct from the task is not required in the trainer, it is advantageous to do so, because the trainer may be available for an extended period, the stimulus of the trainee may influence the neural activity patterns, and it is likely that the trainer will have correlated stimulus-response neural activity patterns with the trainee(s). It should be noted that the foregoing has suggested that the trainer is a single individual, while in practice, the trainer may be a population of trainers or skilled individuals. The analysis and processing of brain activity data may, therefore, be adaptive, both for each respective individual and for the population as a whole.

For example, the system may determine that not all human subjects have common stimulus-response brain activity correlates, and therefore that the population needs to be segregated and clustered. If the differences may be normalized, then a normalization matrix or other correction may be employed. On the other hand, if the differences do not permit feasible normalization, the population(s) may be segmented, with different trainers for the different segments. For example, in some tasks, male brains have different activity patterns and capabilities than female brains. This, coupled with anatomical differences between the sexes, implies that the system may provide gender-specific implementations. Similarly, age differences may provide a rational and scientific basis for segmentation of the population. However, depending on the size of the information base and matrices required, and some other factors, each system may be provided with substantially all parameters required for the whole population, with a user-specific implementation based on a user profile or initial setup, calibration, and system training session.

According to one aspect of the present invention, a trainer subject is instrumented with sensors to determine localized brain activity during a task, which may be mental or physical. The objective is to identify regions of the brain involved in learning new skills or tasks and the patterns in those regions, which reflect the readiness for learning or the learning itself.

The trainer may be a trained and/or skilled individual, an individual in the course of training, and the training data set may be derived from a classified population of individuals.

The sensors will typically seek to determine neuron firing patterns and brain region excitation patterns, which can be detected by implanted electrodes, transcutaneous electroencephalograms, magnetoencephalograms, and other technologies. Where appropriate, transcutaneous EEG is preferred, since this is non-invasive and relatively simple.

Task performance data is also obtained from the trainer, to provide correlates of physical, mental or result data with sensor data.

The trainer is observed with the sensors in a quiet state, a state in which he or she is learning the skill and/or task at issue, and various control states in which the trainer is at rest or engaged in different activities and learning different tasks. The training data may be obtained for a sufficiently long period of time and over repeated trials to determine the effect of duration. The training data may also be a population statistical result, and need not be derived from only a single individual at a single time.

The sensor data is then processed using a 4D (or higher) model to determine the characteristic location-dependent pattern of brain activity over time associated with learning or performing the skill and/or task of interest. Where the data is derived from a population with various degrees of training in the skill or the task, the model maintains this training state variable dimension.

A trainee is then prepared for the training. The state of learning of the trainee for the task may be assessed. This can include the physical or results level, with metrics about task performance. Further, the transcutaneous EEG (or other brain activity data) of the trainee may be obtained, to determine the starting state for the trainee, as well as activity during performance of the task.

In addition, a set of stimuli, such as visual patterns, acoustic patterns, vestibular, smell, taste, touch flight touch, deep touch, proprioception, stretch, hot, cold, pain, pleasure, electric stimulation, acupuncture, etc.), vagus nerve (e.g., parasympathetic), are imposed on the subject, optionally over a range of baseline brain states, to acquire data defining the effect of individual and various combinations of sensory stimulation on the brain state of the trainee. Population data may also be used for this aspect.

The data from the trainer or population of trainers (see above) may then be processed in conjunction with the trainee or population of trainee data, to extract information defining the optimal sensory stimulation over time of the trainee to achieve the desired brain state to learn the task.

In general, for populations of trainers and trainees, the data processing task is immense. However, the statistical analysis will generally be of a form that permits parallelization of mathematical transforms for processing the data, which can be efficiently implemented using various parallel processors, a common form of which is a SIMD (single instruction, multiple data) processor, found in typical graphics processors (GPUs). Because of the cost-efficiency of GPUs, it is referred to implement the analysis using efficient parallelizable algorithms, even if the computational complexity is nominally greater than a CISC-type processor implementation.

During training of the trainee, the EEG pattern may be monitored to determine if the desired state is achieved through the sensory stimulation. A closed loop feedback control system may be implemented to modify the sensory stimulation seeking to achieve the target. An evolving genetic algorithm may be used to develop a user model, which relates the task, trainee task performance, sensory stimulation, and brain activity patterns, both to optimize the current session of stimulation and learning, as well as to facilitate future sessions, where the skills of the trainee have further developed, and to permit use of the system for a range of tasks.

The stimulus may comprise a chemical messenger or stimulus to alter the subject's level of consciousness or otherwise alter brain chemistry or functioning. The chemical may comprise a hormone or endocrine analog molecule, (such as adrenocorticotropic hormone [ACTH] (4-11)), a stimulant (such as cocaine, caffeine, nicotine, phenethylamines), a psychoactive drug, psychotropic or hallucinogenic substance (a chemical substance that alters brain function, resulting in temporary changes in perception, mood, consciousness and behavior such as pleasantness (e.g. euphoria) or advantageousness (e.g., increased alertness).

While typically, controlled or “illegal” substances are to be avoided, in some cases, these may be appropriate for use. For example, various drugs may alter the state of the brain to enhance or selectively enhance the effect of the stimulation. Such drugs include stimulants (e.g., cocaine, methylphenidate (Ritalin), ephedrine, phenylpropanolamine, amphetamines), narcotics/opiates (opium, morphine, heroin, methadone, oxymorphine, oxycodone, codeine, fentanyl), hallucinogens (lysergic acid diethylamide (LSD), PCP, MDMA (ecstasy), mescaline, psilocybin, magic mushroom (Psilocybe cubensis), Amanita muscaria mushroom, marijuana/cannabis), Salvia divinorum, diphenhydramine (Benadryl), flexeril, tobacco, nicotine, bupropion (Zyban), opiate antagonists, depressants, gamma aminobutyric acid (GABA) agonists or antagonists, NMDA receptor agonists or antagonists, depressants (e.g., alcohol, Xanax; Valium; Halcion; Librium; other benzodiazepines, Ativan; Klonopin; Amytal; Nembutal; Seconal; Phenobarbital, other barbiturates), psychedelics, disassociatives, and deliriants (e.g., a special class of acetylcholine-inhibitor hallucinogen). For example, Carhart-Harris showed using fMRI that LSD and psilocybin caused synchronisation of different parts of the brain that normally work separately by making neurons fire simultaneously. This effect can be used to induce synchronization of various regions of the brain to promote focus and enhanced congnitive function desirable for learning and performance.

It is an object of the present invention to provide a system and method for facilitating a skill-learning process, comprising: determining a neuronal activity pattern, of a skilled subject while engaged in a respective skill; processing the determined neuronal activity pattern with at least one automated processor; and subjecting a subject training in the respective skill to a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral excitation, a transcranial excitation, and a deep brain stimulation, dependent on the processed electromagnetic determined neuronal activity pattern.

It is yet another object of the present invention to provide a system and method for facilitating a skill or information-learning process, comprising: determining a neuronal activity pattern of a skilled subject with the knowledge of a respective skill or information while engaged in learning this skill or information; processing the determined neuronal activity pattern with at least one automated processor; and subjecting a subject learning the respective skill or information to a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral excitation, a transcranial excitation, and a deep brain stimulation, dependent on the processed electromagnetic determined neuronal activity pattern.

It is still another object of the present invention to provide a system and method for improving performance of an activity, comprising: determining a neuronal activity pattern, of a skilled subject with mastery of a respective activity while engaged in performing the respective activity; processing the determined neuronal activity pattern with at least one automated processor; and subjecting a subject performing the respective activity to a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral excitation, a transcranial excitation, and a deep brain stimulation, dependent on the processed electromagnetic determined neuronal activity pattern.

It is also an object of the present invention to provide an apparatus for facilitating a skill learning process, comprising: an input, configured to receive data representing a neuronal activity pattern of a skilled subject while engaged in a respective skill; at least one automated processor, configured to process the determined neuronal activity pattern, to determine neuronal activity patterns selectively associated with successful learning of the skill; and a stimulator, configured to subject a subject training in the respective skill to a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral excitation, a transcranial excitation, and a deep brain stimulation, dependent on the processed determined neuronal activity pattern.

It is further an object of the present invention to provide an apparatus for facilitating a skill or information learning process, comprising: an input, configured to receive data representing a neuronal activity pattern of a skilled subject while engaged in a respective skill or learning information; at least one automated processor, configured to process the determined neuronal activity pattern, to determine neuronal activity patterns selectively associated with successful learning of the skill or information; and a stimulator, configured to subject a subject training in the respective skill or learning the information to a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral excitation, a transcranial excitation, and a deep brain stimulation, dependent on the processed determined neuronal activity pattern.

It is also an object of the present invention to provide an apparatus for improving a performance of an activity, comprising: an input, configured to receive data representing a neuronal activity pattern of a skilled subject while engaged in the performance of an activity; at least one automated processor, configured to process the determined neuronal activity pattern, to determine neuronal activity patterns selectively associated with effective performance of the respective activity; and a stimulator, configured to subject a less-experienced subject performing the respective activity to a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral excitation, a transcranial excitation, and a deep brain stimulation, dependent on the processed determined neuronal activity pattern.

It is a further object of the present invention to provide a system for influencing a brain electrical activity pattern of a subject during training in a task, comprising: an input, configured to determine a target brain activity state for the subject, dependent on the task; at least one processor, configured to generate a stimulation pattern profile adapted to achieve the target brain activity state for the subject, dependent on the task; and a stimulator, configured to output at least one stimulus, proximate to the subject, dependent on the generated stimulation pattern profile.

It is yet a further object of the present invention to provide a system for influencing a brain electrical activity pattern of a subject during learning new information, comprising: an input, configured to determine a target brain activity state for the subject, dependent on the nature of the respective information; at least one processor, configured to generate a stimulation pattern profile adapted to achieve the target brain activity state for the subject, dependent on the task; and a stimulator, configured to output at least one stimulus, proximate to the subject, dependent on the generated stimulation pattern profile.

It is still a further object of the present invention to provide a system for influencing a brain electrical activity pattern of a subject during performing of an activity, comprising: an input, configured to determine a target brain activity state for the subject, dependent on the activity; at least one processor, configured to generate a stimulation pattern profile adapted to achieve the target brain activity state for the subject, dependent on the activity; and a stimulator, configured to output at least one stimulus, proximate to the subject, dependent on the generated stimulation pattern profile.

It is a still further object of the present invention to provide a system for determining a target brain activity state for a subject, dependent on a task, comprising: a first monitor, configured to acquire a brain activity of a first subject during performance of a task; at least one first processor, configured to analyze a spatial brain activity state over time of the first subject; and determine spatial brain activity states of the first subject, which represent readiness for training in the task; a second monitor, configured to acquire a brain activity of a second subject during performance of a variety of activities, under a variety of stimuli; and at least one second processor, configured to: analyze a spatial brain activity state over time of the second subject; and translate the determined spatial brain activity states of the first subject which represent readiness for training in the task, into a stimulus pattern for the second subject to achieve a spatial brain activity state in the second subject corresponding to readiness for training in the task.

It is a still further object of the present invention to provide a system for determining a target brain activity state for a subject, dependent on a physical activity, comprising: a first monitor, configured to acquire a brain activity of a first subject during performance of a physical activity; at least one first processor, configured to analyze a spatial brain activity state over time of the first subject; and determine spatial brain activity states of the first subject, which represent readiness for training in the task; a second monitor, configured to acquire a brain activity of a second subject during performance of a variety of activities, under a variety of stimuli; and at least one second processor, configured to: analyze a spatial brain activity state over time of the second subject; and translate the determined spatial brain activity states of the first subject which represent readiness for training in the task, into a stimulus pattern for the second subject to achieve a spatial brain activity state in the second subject corresponding to optimal physical activity.

It is a further object to provide a method of teaching a task to a first subject, the method comprising: recording a second subject's brainwaves EEG while at rest; having the second subject perform said task; recording the second subject's brainwaves EEG while performing said task; extracting a predominant temporal pattern associated with said task from the recorded brainwaves by comparing them with the brainwaves at rest; encoding said temporal pattern as a digital code stored in a tangible media; and using said digital code to modulate the temporal pattern on a signal perceptible to the first subject while said first subject is learning said one if a mental and a motor skill, whereby said light signal stimulates in the second subject brain waves having said temporal pattern to accelerate learning of said task.

It is still a further object to provide a method of enhancing performance of a task of a first subject, the method comprising: recording a second subject's brainwaves EEG while at rest; having the second subject perform said task; recording the second subject's brainwaves EEG while performing said task; extracting a predominant temporal pattern associated with said task from the recorded brainwaves by comparing them with the brainwaves at rest; encoding said temporal pattern as a digital code stored in a tangible media; and using said digital code to modulate the temporal pattern on a signal perceptible to the first subject while said first subject is performing said task, whereby said light signal stimulates in the second subject brain waves having said temporal pattern to enhance the performance of said task.

A still further object provides a method of assisted reading a new text by a first subject, the method comprising: recording a second subject's brainwaves EEG while at rest, wherein the second subject is knowledgeable in the subject matter of the text; having the second subject read the text; recording the second subject's brainwaves EEG while reading the text; extracting a predominant temporal pattern associated with reading the text from the recorded brainwaves by comparing them with the brainwaves at rest; encoding said temporal pattern as a digital code stored in a tangible media; and using said digital code to modulate the temporal pattern on a signal perceptible to the first subject while the first subject is reading, whereby said signal stimulates in the first subject brain waves having said temporal pattern to accelerate reading, comprehension, and retention of the text.

It is another object to provide a computer readable medium, storing therein non-transitory instructions for a programmable processor to perform a process, comprising the computer-implemented steps: synchronizing brain activity data of a subject with at least one event involving the subject; analyzing the brain activity data to determine a selective change in the brain activity data corresponding to a timing of the event; and determine a stimulation pattern adapted to induce a brain activity having a correspondence to the brain activity data associated with the event, based on at least a brain activity model.

The at least one of a sensory excitation, peripheral excitation, and transcranial excitation may be generated based on a digital code. The subjecting of the subject training in the respective skill to the sensory excitation increases a learning rate of the skill in the training subject. Similarly, the subjecting of the subject learning the respective new information to the sensory excitation increases a learning rate of the new information in the learning subject. Likewise, the subjecting of the subject engaged in the respective physical activity to the sensory excitation improves the performance of the respective physical activity in the subject engages in the respective activity.

The method may further comprise determining a neuronal baseline activity of the skilled subject while not engaged in the skill, a neuronal baseline activity of the subject training in the respective skill while not engaged in the skill, a neuronal activity of the skilled subject while engaged in the respective skill, and/or a neuronal activity of the subject training in the respective skill while engaged in the skill.

The method may further comprise determining a neuronal baseline activity of the skilled subject while not engaged in the learning of new information, a neuronal baseline activity of the subject learning respective information while not engaged in the learning, a neuronal activity of the skilled subject while engaged in the learning, and/or a neuronal activity of the subject learning respective information while engaged in the learning.

The method may further comprise determining a neuronal baseline activity of the skilled subject while not engaged in the physical activity, a neuronal baseline activity of the less-experienced subject to be engaged in a physical activity while not engaged in the physical activity, a neuronal activity of the skilled subject while engaged in the respective physical activity, and/or a neuronal activity of the less-experienced subject while engaging in the respective physical activity.

The skilled subject may be at the same level of training as the trainee, or one or more stages advanced beyond the training of the trainee.

The representation of the processed the determined neuronal activity pattern may be stored in memory. The storage could be on a tangible medium as an analog or digital representation. It is possible to store the representation in a data storage and access system either for a permanent backup or further processing the respective representation. The storage can also be in a cloud storage and/or processing system.

The neuronal activity pattern may be obtained by electroencephalography, magnetoencephalography, MRI, fMRI, PET, low-resolution brain electromagnetic tomography, or other electrical or non-electrical means.

The neuronal activity pattern may be obtained by at least one implanted central nervous system (cerebral, spinal) or peripheral nervous system electrode. An implanted neuronal electrode can be either within the peripheral nervous system or the central nervous system. The recording device could be portable or stationary. Either with or without onboard electronics such as signal transmitters and/or amplifiers, etc. The at least one implanted electrode can consist of a microelectrode array featuring more than one recording site. Its main purpose can be for stimulation and/or recoding.

The neuronal activity pattern may be obtained by at least a galvanic skin response. Galvanic skin response or resistance is often also referred as electrodermal activity (EDA), psychogalvanic reflex (PGR), skin conductance response (SCR), sympathetic skin response (SSR) and skin conductance level (SCL) and is the property of the human body that causes continuous variation in the electrical characteristics of the skin.

The stimulus may comprise a sensory excitation. The sensory excitation may by either sensible or insensible. It may be either peripheral or transcranial. It may consist of at least one of a visual, an auditory, a tactile, a proprioceptive, a somatosensory, a cranial nerve, a gustatory, an olfactory, a pain, a compression and a thermal stimulus or a combination of aforesaid. It can, for example, consist of light flashes either within ambient light or aimed at the subject's eyes, 2D or 3D picture noise, modulation of intensity, within the focus of the subject's eye the visual field or within peripheral sight.

The stimulus may comprise a peripheral excitation, a transcranial excitation, a sensible stimulation of a sensory input, an insensible stimulation of a sensory input, a visual stimulus, an auditory stimulus, a tactile stimulus, a proprioceptive stimulus, a somatosensory stimulus, a cranial nerve stimulus, a gustatory stimulus, an olfactory stimulus, a pain stimulus, an electric stimulus, a magnetic stimulus, or a thermal stimulus.

The stimulus may comprise transcranial magnetic stimulation (TMS), cranial electrotherapy stimulation (CES), transcranial direct current stimulation (tDCS), comprise transcranial alternating current stimulation (tACS), transcranial random noise stimulation (tRNS), comprise transcranial pulsed current stimulation (tPCS), pulsed electromagnetic field (PEMF), or noninvasive or invasive deep brain stimulation (DBS), for example.

The stimulus may comprise transcranial pulsed ultrasound (TPU).

The stimulus may comprise a cochlear implant stimulus, spinal cord stimulation (SCS) or a vagus nerve stimulation (VNS), or other direct or indirect cranial or peripheral nerve stimulus.

The stimulus may comprise or achieve brainwave entrainment.

The stimulus may comprise electrical stimulation of the retina, a pacemaker, a stimulation microelectrode array, electrical brain stimulation (EBS), focal brain stimulation (FBS), light, sound, vibrations, an electromagnetic wave. The light stimulus may be emitted by at least one of a light bulb, a light emitting diode (LED), and a laser. The signal may be one of a light ray, a sound wave, and an electromagnetic wave. The signal may be a light signal projected onto the first subject by one of a smart bulb generating ambient light, at least one LED position near the eyes of the first subject and laser generating low-intensity pulses.

The skill may comprise a mental skill. For example, mental skill can be a cognitive skill, an alertness skill, a concentration skill, an attention skill, a focusing skill, a memorization skill, a visualization skill, a relaxation skill, a meditation skill, a speedreading skill, a creative skill, “whole-brain-thinking” skill, an analytical skill, a reasoning skill, a problem-solving skill, a critical thinking skill, an intuitive skill, a leadership skill, a learning skill, a speedreading skill, a patience skill, a balancing skill, a perception skill, a linguistic or language skill, a language comprehension skill, a quantitative skill, a “fluid intelligence” skill, a pain management skill, a skill of maintaining positive attitude, a foreign language skill, a musical skill, a musical composition skill, a writing skill, a poetry composition skill, a mathematical skill, a science skill, an art skill, a visual art skill, a rhetorical skill, an emotional control skill, an empathy skill, a compassion skill, a motivational skill, people skill, a computational skill, a science skill, or an inventorship skill. See, U.S. Patent and Pub. U.S. Pat. Nos. 6,435,878, 5,911,581, and 20090069707.

The skill may comprise a motor skill, e.g., fine motor, muscular coordination, walking, running, jumping, swimming, dancing, gymnastics, yoga; an athletic or sports skill, a massage skill, martial arts or fighting, shooting, self-defense; speech, singing, playing a musical instrument, penmanship, calligraphy, drawing, painting, visual, auditory, olfactory, game-playing, gambling, sculptor's, craftsman, massage, or assembly.

The technology may be embodied in apparatuses for acquiring the brain activity information from the trainer, processing the brain activity information to reveal a target brain activity state and a set of stimuli, which seek to achieve that state in a trainee, and generating stimuli for the trainee to achieve and maintain the target brain activity state over a period of time and potential state transitions. The generated stimuli may be feedback controlled. A general-purpose computer may be used for the processing of the information, a microprocessor, a FPGA, an ASIC, a system-on-a-chip, or a specialized system, which employs a customized configuration to efficiently achieve the information transformations required. Typically, the trainer and trainee act asynchronously, with the brain activity of the trainer recorded and later processed. However, real-time processing and brain activity transfer are also possible. In the case of a general purpose programmable processor implementation or portions of the technology, computer instructions may be stored on a nontransitory computer readable medium.

It is another object to provide a method of teaching one of a mental skill and a motor skill to a first subject, the method comprising: recording a second subject's brainwaves EEG while at rest; having the second subject perform said one of a mental skill and a motor skill; recording the second subject's brainwaves EEG while performing said one of a mental skill and a motor skill; extracting a predominant temporal pattern associated with said one of a mental skill and a motor skill from the recorded brainwaves by comparing them with the brainwaves at rest; encoding said temporal pattern as a digital code stored in a tangible media; and using said digital code to modulate the temporal pattern on a signal perceptible to the first subject while the first subject is learning said one if a mental and a motor skill, whereby said light signal stimulates in the first subject brain waves having said temporal pattern to accelerate learning of said one if a mental skill and a motor skill.

A further object provides a high-definition transcranial alternating current stimultion (HD-tACS) stimultion of a trainee, having a stimulation frequency, amplitude pattern, spatial pattern, dependent on an existing set of states in the target, and a set of brainwave patterns from a trainor engaged in an activity, adapted to improve the learning or performance of the trainee.

Another object provides a system and method for facilitating a skill-learning process, comprising: determining a neuronal activity pattern, of a skilled subject while engaged in a respective skill; processing the determined neuronal activity pattern with at least one automated processor; and subjecting a subject training in the respective skill to a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral excitation, a transcranial excitation, and a deep brain stimulation, dependent on the processed electromagnetic determined neuronal activity pattern while the subject is subjected to tES, a psychedelic and/or other pharmaceutical agents.

It is a still further object to provide a method of facilitating a skill learning process, comprising: determining a neuronal activity pattern of a skilled subject while engaged in a respective skill; processing the determined neuronal activity pattern with at least one automated processor; subjecting a subject training in the respective skill to one of transcranial electric stimulation (tES) and magnetic brain stimulation; and subjecting a subject training in the respective skill to a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral excitation, a transcranial excitation, and a deep brain stimulation, dependent on the processed determined neuronal activity pattern. The transcranial electric stimulation (tES) may be one of transcranial direct current stimulation (tDCS), transcranial alternative current stimulation (tACS), and high-definition transcranial alternative current stimulation (tES).

Another object provides a method of facilitating a skill learning process, comprising: determining a neuronal activity pattern of a skilled subject while engaged in a respective skill; processing the determined neuronal activity pattern with at least one automated processor; subjecting a subject training in the respective skill to one of a pharmaceutical agent and a psychedelic agent; and subjecting a subject training in the respective skill to a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral excitation, a transcranial excitation, and a deep brain stimulation, dependent on the processed determined neuronal activity pattern.

A further object provides a method of facilitating a mental process, comprising: determining brainwave neural correlates associated with a mental process of a first subject; processing the brainwave neural correlates with at least one automated processor, to extract at least a modulated neural activity pattern; and subjecting a second subject to a stimulus having a modulation selectively dependent on the modulated neural activity pattern.

A computer-readable medium is provided, storing therein non-transitory instructions for a programmable processor to perform a process, comprising the computer-implemented steps of: reading information from a memory representing dynamic neuronal activity patterns selectively associated with the skill or task; and controlling a stimulator, to stimulate a subject with a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral neural excitation, a transcranial excitation, and a deep brain stimulation, dependent on the dynamic neuronal activity patterns selectively associated with the skill or task, to facilitate performance of the respective skill or task by a stimulated subject.

An apparatus is provided for facilitating a skill or task, comprising: a memory, configured to store automatically processed dynamic neuronal activity pattern, to define dynamic neuronal activity patterns selectively associated with the skill or task; and a stimulator, configured to stimulate a subject with a stimulus selected from the group consisting of one or more of a sensory excitation, a peripheral excitation, a transcranial excitation, and a deep brain stimulation, dependent on the defined dynamic neuronal activity patterns selectively associated with the skill or task, to facilitate performance of the respective skill or task by the subject.

The mental process may comprise a skill or task, the brainwave neural correlates are determined while the first subject is engaged in the skill or task, and the modulated neural activity pattern is selectively associated with the skill or task. The second subject may be engaged in the skill or task in temporal proximity to said subjecting the second subject to the stimulus, and the stimulus comprises at least one of a sensory stimulation and a transcranial stimulation.

The stimulus may be generated based on a digitally coded waveform representing the modulated neural activity pattern.

The method may further comprise determining brainwave neural correlates associated with the mental process of the second subject.

The brainwave neural correlates associated with the mental process of the first subject may be acquired by at least one of electroencephalography, magnetoencephaography, brain electromagnetictomography, positron emission tomography, and functional magnetic resonance imaging.

The stimulus may be one or more of a peripheral sensory neuron excitation, a cranial nerve stimulation, a transcranial electrical stimulation, a transcranial magnetic stimulation of the second subject, a visual stimulus, and an auditory stimulus. The stimulus may be selected from the group consisting of one or more of a tactile stimulus, a proprioceptive stimulus, a somatosensory stimulus, a gustatory stimulus, an olfactory stimulus, a pain stimulus, a thermal stimulus, spinal cord stimulation (SCS), transcranial pulsed ultrasound (TPU), pulsed electromagnetic field (PEMF), noninvasive deep brain stimulation, cochlear implant stimulus, deep brain stimulation (DBS), electrical stimulation of the retina, pacemaker stimulation, microelectrode array stimulation, vagus nerve stimulation (VNS), electrical brain stimulation (EBS), and focal brain stimulation (FBS). The stimulus may be adapted to achieve brainwave entrainment. The stimulus may be generated based on a digitally coded stimulation waveform. The stimulator may comprise at least one of a sensory neuron stimulator, a transcranial electrical stimulator, a transcranial alternating current stimulator (tACS), a transcranial magnetic stimulation (TMS), a visual stimulator, an auditory stimulator, a tactile stimulator, a proprioceptive stimulator, a somatosensory stimulator, a gustatory stimulator, an olfactory stimulator, a pain stimulator, a thermal stimulator, a spinal cord stimulator, a transcranial pulsed ultrasound (TPU) stimulator, a pulsed electromagnetic field (PEMF) stimulator, a noninvasive deep brain stimulator, a cochlear implant stimulator, a deep brain stimulator, a retinal electrical stimulator, a pacemaker stimulator, a microelectrode array stimulator, a vagus nerve stimulator, an electrical brain stimulator, and a focal brain stimulator. The stimulator may be configured to cause brainwave entrainment. The stimulus may comprise a peripheral or central neural stimulation of the subject with a signal having a modulation corresponding to a neuronal activity pattern defined by a recording of brainwaves of a human.

The mental process may comprise a motor skill. The mental process may comprise at least one of a mental skill, a motor skill, a musical instrument playing skill, a singing skill, a dancing skill, a sports skill, a martial arts skill, a speech skill, a mathematical skill, a calligraphical skill, a drawing skill, a painting skill, a massage skill, an assembly skill, a walking skill, a running skill, a swimming skill, a yoga skill, a fighting skill, a shooting skill, a self-defense skill, an olfactory skill, and a muscular coordination skill.

The apparatus may further comprise an input configured to acquire neural correlates associated with the skill or task of the subject. The neural correlates associated with the task or skill may be acquired by at least one of electroencephalography, magnetoencephaography, brain electromagnetic tomography, positron emission tomography, functional magnetic resonance imaging, an implanted electrode, and galvanic skin response.

The skill or task may comprise at least one of a mental skill, a motor skill, a musical instrument playing skill, a singing skill, a dancing skill, a sports skill, a martial arts skill, a speech skill, a mathematical skill, a calligraphical skill, a drawing skill, a painting skill, a massage skill, an assembly skill, a walking skill, a running skill, a swimming skill, a yoga skill, a fighting skill, a shooting skill, a self-defense skill, an olfactory skill, a muscular coordination skill, a memorization, a native language, a foreign language, literature, arithmetic, algebra, geometry, calculus, mathematics, physics, chemistry, biology, history, economics, geography, a social science, physical education, health, art, and music.

The stimulator may comprise a binaural stimulator configured to at least one of: induce a desired predominant brainwave frequency in the subject; expose the subject to an isochronictone; and expose the subject to binaural beats. The stimulator may comprise a binocular stimulator configured to present optical signals having different amplitude modulated optical signals to each respective eye. The stimulator may be configured to concurrently electrically or magnetically stimulate different parts of the subject's brain with signals having different frequencies. The stimulator may comprise an optical illuminator configured to produce optical patterns having a tine-varying intensity pattern corresponding to the dynamic neuronal activity patterns, wherein the dynamic neuronal activity patterns have a waveform corresponding to an acquired brainwave.

The apparatus may further comprise an input configured to receive brainwave signals; and at least one processor configured to process the received brainwave signals to define the dynamic neuronal activity pattern, wherein the received brainwave signals are not from the same subject at the same time.

The processed dynamic neuronal activity pattern may comprise a plurality of frequency patterns of brainwave activity of a human while engaged in different aspects of the skill or task; and the stimulus comprises a sequence of phases respectively representing the plurality of frequency patterns.

The stimulus may comprise a concurrent plurality of stimulation signal frequencies.

The apparatus may further comprise at least one processor configured to analyze an input received from the subject to determine readiness for the task, and to control the stimulator dependent on the determined readiness for the task.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows the electric activity of a neuron contributing to a brainwave.

FIG. 2 shows transmission of an electrical signal generated by a neuron through the skull, skin and other tissue to be detectable by an electrode transmitting this signal to EEG amplifier.

FIG. 3 shows an illustration of a typical EEG setup with a subject wearing a cup with electrodes connected to the EEG machine, which is, in turn, connected to a computer screen displaying the EEG.

FIG. 4 shows one second of a typical EEG signal.

FIG. 5 shows a typical EEG reading.

FIG. 6 shows main brainwave patterns.

FIG. 7 shows a flowchart according to one embodiment of the invention.

FIG. 8 shows a flowchart according to one embodiment of the invention.

FIG. 9 shows a flowchart according to one embodiment of the invention.

FIG. 10 shows a flowchart according to one embodiment of the invention.

FIG. 11 shows a flowchart according to one embodiment of the invention.

FIG. 12 shows a flowchart according to one embodiment of the invention.

FIG. 13 shows a flowchart according to one embodiment of the invention.

FIG. 14 shows a schematic representation of an apparatus according to one embodiment of the invention.

FIG. 15 shows brainwave real-time BOLD (Blood Oxygen Level Dependent) fMRI studies acquired with synchronized stimuli.

FIG. 16 shows Brain Entrainment Frequency Following Response (or FFR).

FIG. 17 shows brainwave entrainment before and after synchronization.

FIG. 18 shows brainwaves during inefficient problem solving and stress.

FIGS. 19 and 20 show how binaural beats work.

FIG. 21 shows Functional Magnetic Resonance Imaging (fMRI)

FIG. 22 shows a photo of a brain forming a new idea.

FIG. 23 shows 3D T2 CUBE (SPACE/VISTA) FLAIR & DSI tractography

FIG. 24 shows an EEG tracing.

FIG. 25 shows a flowchart according to one embodiment of the invention.

FIG. 26 shows a flowchart according to one embodiment of the invention.

FIG. 27 shows a flowchart according to one embodiment of the invention.

FIG. 28 shows a flowchart according to one embodiment of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that the present disclosure may be readily implemented by those skilled in the art. However, it is to be noted that the present disclosure is not limited to the embodiments but can be embodied in various other ways. In drawings, parts irrelevant to the description are omitted for the simplicity of explanation, and like reference numerals denote like parts through the whole document.

Through the whole document, the term “connected to” or “coupled to” that is used to designate a connection or coupling of one element to another element includes both a case that an element is “directly connected or coupled to” another element and a case that an element is “electronically connected or coupled to” another element via still another element. Further, it is to be understood that the term “comprises or includes” and/or “comprising or including” used in the document means that one or more other components, steps, operation and/or existence or addition of elements are not excluded in addition to the described components, steps, operation and/or elements unless context dictates otherwise.

Through the whole document, the term “unit” or “module” includes a unit implemented by hardware or software and a unit implemented by both of them. One unit may be implemented by two or more pieces of hardware, and two or more units may be implemented by one piece of hardware.

The present invention generally relates to enhancing emotional response by a subject in connection with the received information by conveying to the brain of the subject temporal patterns of brainwaves of a second subject who had experienced such emotional response, said temporal pattern being provided non-invasively via light, sound, transcranial direct current stimulation (tDCS), transcranial alternating current stimulation (tDAS) or HD-tACS, transcranial magnetic stimulation (TMS) or other means capable of conveying frequency patterns.

The transmission of the brain waves can be accomplished through direct electrical contact with the electrodes implanted in the brain or remotely employing light, sound, electromagnetic waves and other non-invasive techniques. Light, sound, or electromagnetic fields may be used to remotely convey the temporal pattern of prerecorded brainwaves to a subject by modulating the encoded temporal frequency on the light, sound or electromagnetic filed signal to which the subject is exposed.

Every activity, mental or motor, every emotion is associated with unique brainwaves having specific spatial and temporal patterns, i.e., a characteristic frequency or a characteristic distribution of frequencies over time and space. Such waves can be read and recorded by several known techniques, including electroencephalography (EEG), magnetoencephalography (MEG), exact low-resolution brain electromagnetic tomography (eLORETA), sensory evoked potentials (SEP), fMRI, functional near-infrared spectroscopy (fNIRS), etc. The cerebral cortex is composed of neurons that are interconnected in networks. Cortical neurons constantly send and receive nerve impulses-electrical activity-even during sleep. The electrical or magnetic activity measured by an EEG or MEG (or another device) device reflects the intrinsic activity of neurons in the cerebral cortex and the information sent to it by subcortical structures and the sense receptors.

“Playing back the brainwaves” to another animal or person by providing decoded temporal pattern through tDCS, tACS, HD-tACS, TMS, or through electrodes implanted in the brain, allows the recipient to learn the task at hand faster. For example, if the brain waves of a mouse navigated a familiar maze are decoded (by EEG or via implanted electrodes), playing this temporal pattern to another mouse unfamiliar with this maze will allow it to learn to navigate this maze faster.

Employing light, sound or electromagnetic field to remotely convey the temporal pattern of brainwaves (which may be prerecorded) to a subject by modulating the encoded temporal frequency on the light, sound or electromagnetic filed signal to which the subject is exposed.

When a group of neurons fires simultaneously, the activity appears as a brainwave. Different brainwave-frequencies are linked to different tasks in the brain.

FIG. 1 shows the electric activity of a neuron contributing to a brainwave.

FIG. 2 shows transmission of an electrical signal generated by a neuron through the skull, skin and other tissue to be detectable by an electrode transmitting this signal to EEG amplifier.

FIG. 3 shows an illustration of a typical EEG setup with a subject wearing a cup with electrodes connected to the EEG machine, which is, in turn, connected to a computer screen displaying the EEG. FIG. 4 shows one second of a typical EEG signal. FIG. 5 shows a typical EEG reading. FIG. 6 shows main brainwave patterns.

FIG. 7 shows a flowchart according to one embodiment of the invention. Brainwaves from a subject engaged in a task are recorded. Brainwaves associated with the task are identified. A temporal pattern in the brainwave associated with the task is decoded. The decoded temporal pattern is used to modulate the frequency of at least one stimulus. The temporal pattern is transmitted to the second subject by exposing the second subject to said at least one stimulus.

FIG. 8 shows a flowchart according to one embodiment of the invention. Brainwaves in a subject at rest and engaged in a task are recorded, and a brainwave characteristic associated with the task is separated by comparing with the brainwaves at rest. A temporal pattern in the brainwave associated with the task is decoded and stored. The stored code is used to modulate the temporal pattern on a stimulus, which is transmitted to the second subject by exposing the second subject to the stimulus

FIG. 9 shows a flowchart according to one embodiment of the invention. Brainwaves in a subject engaged in a task are recorded, and a Fourier Transform analysis performed. A temporal pattern in the brainwave associated with the task is then decoded and stored. The stored code is then used to modulate the temporal pattern on a stimulus, which is transmitted to the second subject by exposing the second subject to the stimulus.

FIG. 10 shows a flowchart according to one embodiment of the invention. Brainwaves in a plurality of subjects engaged in a respective task are recorded. A neural network is trained on the recorded brainwaves associated with the task. After the neural network is defined, brainwaves in a first subject engaged in the task are recorded. The neural network is used to recognize brainwaves associated with the task. A temporal pattern in the brainwaves associated with the task is decoded and stored. The code is used to modulate the temporal pattern on a stimulus. Brainwaves associated with the task in a second subject are induced by exposing the second subject to the stimulus

FIG. 11 shows a flowchart according to one embodiment of the invention. Brainwaves in a subject both at rest and engaged in a task are recorded. A brainwave pattern associated with the task is separated by comparing with the brainwaves at rest. For example, a filter or optimal filter may be designed to distinguish between the patterns. A temporal pattern in the brainwave associated with the task is decoded, and stored in software code, which is then used to modulate the temporal pattern of light, which is transmitted to the second subject, by exposing the second subject to the source of the light.

FIG. 12 shows a flowchart according to one embodiment of the invention. Brainwaves in a subject at rest and engaged in a task are recoded. A brainwave pattern associated with the task is separated by comparing with the brainwaves at rest. A temporal pattern in the brainwave associated with the task is decoded and stored as a temporal pattern in software code. The software code is used to modulate the temporal pattern on a sound signal. The temporal pattern is transmitted to the second subject by exposing the second subject to the sound signal.

FIG. 13 shows a flowchart according to one embodiment of the invention. Brainwaves in a subject engaged in a task are recorded, and brainwaves selectively associated with the task are identified. A pattern, e.g., a temporal pattern, in the brainwave associated with the task, is decoded and used to entrain the brainwaves of the second subject.

FIG. 14 shows a schematic representation of an apparatus according to one embodiment of the invention.

FIG. 15 shows brainwave real time BOLD (Blood Oxygen Level Dependent) fMRI studies acquired with synchronized stimuli.

FIG. 16 shows FIG. 17 shows brainwave entrainment before and after synchronization. See, Understanding Brainwaves to Expand our Consciousness, fractalenlightenment.com/14794/spiritualityunderstanding-brainwaves-to-expand-our-consciousness

FIG. 18 shows brainwaves during inefficient problem solving and stress.

FIGS. 19 and 20 show how binaural beats work. Binaural beats are perceived when two different pure-tone sine waves, both with frequencies lower than 1500 Hz, with less than a 40 Hz difference between them, are presented to a listener dichotically (one through each ear). See, en.wikipedia.org/wiki/Beat_(acoustics)#Binaural_beats. For example, if a 530 Hz pure tone is presented to a subject's right ear, while a 520 Hz pure tone is presented to the subject's left ear, the listener will perceive the auditory illusion of a third tone, in addition to the two pure-tones presented to each ear. The third sound is called a binaural beat, and in this example would have a perceived pitch correlating to a frequency of 10 Hz, that being the difference between the 530 Hz and 520 Hz pure tones presented to each ear. Binaural-beat perception originates in the inferior colliculus of the midbrain and the superior olivary complex of the brainstem, where auditory signals from each ear are integrated and precipitate electrical impulses along neural pathways through the reticular formation up the midbrain to the thalamus, auditory cortex, and other cortical regions.

FIG. 21 shows Functional Magnetic Resonance Imaging (fMRI)

FIG. 22 shows a photo of a brain forming a new idea.

FIG. 23 shows 3D T2 CUBE (SPACE/VISTA) FLAIR & DSI tractography.

FIG. 24 shows The EEG activities for a healthy subject during a working memory task.

FIG. 25 shows a flowchart according to one embodiment of the invention. Brainwaves in a subject engaged in a task are recorded. Brainwaves associated with the task are identified. A temporal pattern in the brainwave associated with the task is extracted. First and second dynamic audio stimuli are generated, whose frequency differential corresponds to the temporal pattern. Binaural beats are provided using the first and the second audio stimuli to stereo headphones worn by the second subject to entrain the brainwaves of the second subject.

FIG. 25 shows a flowchart according to one embodiment of the invention. Brainwaves of a subject engaged in a task are recorded, and brainwaves associated with the task identified. A pattern in the brainwave associated with the task is identified, having a temporal variation. Two dynamic audio stimuli whose frequency differential corresponds to the temporal variation are generated, and applied as a set of binaural bits to the second subject, to entrain the brainwaves of the second subject.

FIG. 26 shows a flowchart according to one embodiment of the invention. Brainwaves of a subject engaged in a task are recorded, and brainwaves associated with the task identified. A pattern in the brainwave associated with the task is identified, having a temporal variation. A series of isochronic tones whose frequency differential corresponds to the temporal variation is generated and applied as a set of stimuli to the second subject, to entrain the brainwaves of the second subject.

FIG. 27 shows a flowchart according to one embodiment of the invention. Brainwaves of a subject engaged in a task are recorded, and brainwaves associated with the task identified. A pattern in the brainwave associated with the task is identified, having a temporal variation. Two dynamic light stimuli whose frequency differential corresponds to the temporal variation are generated, and applied as a set of stimuli to the second subject, wherein each eye sees only one light stimuli, to entrain the brainwaves of the second subject.

FIG. 28 shows a flowchart according to one embodiment of the invention. Brainwaves of a subject engaged in a task are recorded, and brainwaves associated with the task identified. A pattern in the brainwave associated with the task is identified, having a temporal variation. Two dynamic electric stimuli whose frequency differential corresponds to the temporal variation are generated, and applied as transcranial stimulation to the second subject, wherein each electric signal is applied to the opposite side of the subject's head, to entrain the brainwaves of the second subject.

EXAMPLE 1

We record EEG of a concert pianist while the pianist is playing a particular piece (e.g., Beethoven sonata); then decode the dynamic spatial and/or temporal patterns of the EEG and encode them in software. If a music student wants to learn this particular Beethoven sonata, we use the software with an encoded dynamic temporal pattern to drive “smart bulbs” or another source of light while the student is learning to play this piece from the music sheet. The result is accelerated learning. See FIG. 1 .

EXAMPLE 2

We record EEG of a martial art master while performing a particular move (say Karate or Kong Fu), decode the dynamic spatial and temporal patterns of the EEG and encode them in software. If a karate student wants to learn this particular move, we use the software with an encoded temporal pattern to drive smart bulbs or another source of light while the student is practicing this move. The result is accelerated learning. FIG. 2 represents an embodiment of the invention as applied to learning a drawing task, which is representative of various motor skills.

EXAMPLE 3

A person is reading a book, and during the course of the reading, brain activity, including electrical or magnetic activity, and optionally other measurements, as acquired. The data is processed to determine the frequency and phase, and dynamic changes of brainwave activity, as well as the spatial location of emission. Based on a brain model, a set of non-invasive stimuli, which may include any and all senses, magnetic nerve or brain stimulation, ultrasound, etc., is devised for a subject who is to read or learn the same book. The subject is provided with the book to read, and the stimuli are presented to the subject synchronized with the progress through the book. Typically, the book is presented to the subject through an electronic reader device, such as a computer or computing pad, to assist in synchronization. The same electronic reader device may produce the temporal pattern of stimulation across the various stimulus modalities. The result is speed reading and improved comprehension and retention of the information. Other examples of skill domains that may be facilitated include learning foreign languages, math, sports or specialized skills. The method of the present invention can be used to accelerate learning of new information, new subjects or fine motor skills.

In this description, several preferred embodiments were discussed. Persons skilled in the art will, undoubtedly, have other ideas as to how the systems and methods described herein may be used. It is understood that this broad invention is not limited to the embodiments discussed herein. Rather, the invention is limited only by the following claims.

The aspects of the invention are intended to be separable and may be implemented in combination, sub-combination, and with various permutations of embodiments. Therefore, the various disclosure herein, including that which is represented by acknowledged prior art, may be combined, sub-combined and permuted in accordance with the teachings hereof, without departing from the spirit and scope of the invention. All references and information sources cited herein are expressly incorporated herein by reference in their entirety. 

What is claimed is:
 1. A method of facilitating a mental process, comprising: determining electrical brainwave neural correlates associated with a mental process and a cerebellar process of a first subject while the first subject is performing a motor task, said electrical brainwave neural correlates associated with the mental process and cerebellar process of the first subject comprising an electrical brainwave waveform, brainwave source spatial location, and transient events; digitally processing the electrical brainwave neural correlates associated with the mental process and cerebellar process of the first subject with at least one automated processor, to extract at least a frequency and phase modulation pattern of the modulated electrical brainwave waveform pattern which is selectively associated with a level of skill of the first subject, during performance of the motor task; determining changes in the frequency and phase modulation pattern of the modulated electrical brainwave waveform pattern associated with performance of the motor task over time with the at least one automated processor; and subjecting the second subject to a stimulus having a modulation comprising at least the determined changes in the frequency and phase modulation pattern of the modulated electrical brainwave waveform pattern, the stimulus being adapted to entrain the cerebrum and cerebellum of the second subject with the electrical brainwave neural correlates associated with the mental process and cerebellar process of the first subject, while the second subject is performing the motor task.
 2. The method according to claim 1, wherein the second subject is performing the motor task in temporal proximity to said subjecting the second subject to the stimulus, and the stimulus comprises at least one of a sensory stimulation and a transcranial stimulation.
 3. The method according to claim 1, wherein the stimulus is generated based on a digitally coded waveform representing the modulated electrical brainwave waveform pattern, further comprising determining electrical brainwave neural correlates of the second subject, and adapting the stimulus dependent on the determined electrical brainwave neural correlates of the second subject.
 4. The method according to claim 1, wherein the electrical brainwave neural correlates comprise electroencephalographic waves, further comprising determining electrical brainwave neural correlates associated with the mental process of the second subject while the second subject is performing the motor task.
 5. The method according to claim 1, wherein the electrical brainwave neural correlates associated with the mental process of the first subject are acquired by at least one of electroencephalography, magnetoencephalography, and brain electromagnetic tomography having at least six channels, and the electrical modulated brainwave waveform pattern is converted to a time-frequency domain transformed representation comprising a wavelet transformed representation of the modulated brainwave pattern over time.
 6. The method according to claim 1, wherein the stimulus is selected from the group consisting of one or more of a peripheral sensory neuron excitation, a cranial nerve stimulation, a transcranial electrical stimulation, a transcranial magnetic stimulation of the second subject, a visual stimulus, and an auditory stimulus.
 7. The method according to claim 1, wherein the stimulus is selected from the group consisting of one or more of a tactile stimulus, a proprioceptive stimulus, a somatosensory stimulus, a gustatory stimulus, an olfactory stimulus, a pain stimulus, a thermal stimulus, spinal cord stimulation (SCS), transcranial pulsed ultrasound (TPU), cochlear implant stimulus, electrical stimulation of the retina, microelectrode array stimulation, vagus nerve stimulation (VNS), electrical brain stimulation (EBS), and focal brain stimulation (FBS).
 8. The method according to claim 1, wherein the digitally processing comprises statistical classification of the electrical brainwave neural correlates associated with the mental process of the first subject, and classification of at least one Bereirschaftspotential which is distinct from frequency and phase modulation pattern of the modulated electrical brainwave waveform pattern.
 9. The method according to claim 1, wherein the mental process comprises a motor coordination skill.
 10. The method according to claim 1, wherein the mental process comprises at least one of a musical instrument playing skill, a singing skill, a dancing skill, a sports skill, a martial arts skill, a speech skill, a calligraphical skill, a drawing skill, a painting skill, a massage skill, an assembly skill, a walking skill, a running skill, a swimming skill, a yoga skill, a fighting skill, a shooting skill, and a self-defense skill.
 11. A computer-readable medium, storing therein non-transitory instructions for a programmable processor to perform a process, comprising: instructions for determining electrical brainwave neural correlates associated with a mental process of a first subject while the first subject is performing a motor task, said electrical brainwave neural correlates associated with the mental process of the first subject comprising brainwave frequency, brainwave spatial location, and transient events; instructions for processing the electrical brainwave neural correlates associated with the mental process of the first subject with at least one automated processor, to extract at least a frequency and phase modulation pattern of the modulated electrical brainwave waveform pattern which is selectively associated with a level of skill of the first subject, during the motor task; instructions for determining changes in the frequency and phase modulation pattern of the modulated electrical brainwave waveform pattern associated with performance of the motor task over time; and instructions for subjecting a second subject to a stimulus having a modulation comprising at least the determined changes in the frequency and phase modulation pattern of the modulated electrical brainwave waveform pattern, the stimulus being adapted to entrain the cerebrum and cerebellum of the second subject with the electrical brainwave neural correlates associated with the mental process of the first subject, while the second subject is performing the motor task.
 12. An apparatus for facilitating a motor task, comprising: means for determining electrical brainwave neural correlates associated with a mental process of a first subject while the first subject is performing the motor task; means for digitally processing the electrical brainwave neural correlates associated with the mental process of the first subject with at least one automated processor, to extract at least a frequency and phase modulation pattern of the electrical brainwave neural correlates which is selectively associated with a level of skill of the first subject, during the motor task, said electrical brainwave neural correlates associated with the mental process of the first subject comprising brainwave frequency, brainwave spatial location, and transient events; means for determining changes in the frequency and phase modulation pattern of the modulated electrical brainwave waveform pattern associated with performance of the motor task over time with the at least one automated processor; and means for subjecting the second subject to a stimulus having a modulation comprising at least the determined changes in the frequency and phase modulation pattern of the modulated electrical brainwave waveform pattern adapted to entrain the cerebrum and cerebellum of the second subject with the electrical brainwave neural correlates associated with the mental process of the first subject, while the second subject is performing the motor task.
 13. The apparatus according to claim 12, wherein the means for subjecting comprises a sensory stimulation apparatus configured to present a concurrent plurality of stimulation signal frequencies.
 14. The apparatus according to claim 13, wherein the means for subjecting comprises an electronic stimulator configured to generate a stimulus based on a digitally coded stimulation waveform, wherein the at least one automated processor is configured to produce a wavelet transformed representation of the modulated brainwave pattern over time.
 15. The apparatus according to claim 12, further comprising an input configured to acquire the electrical brainwave neural correlates associated with the mental process of the first subject.
 16. The apparatus according to claim 15, wherein the electrical brainwave neural correlates associated with the mental process of the first subject are acquired by at least one of electroencephalography, magnetoencephalography, brain electromagnetic tomography, and an implanted electrode, with at least six channels and the extracted modulated brainwave pattern comprises a wavelet transformed representation of the modulated brainwave pattern over time.
 17. The apparatus according to claim 12, wherein the means for subjecting comprises a stimulator selected from the group consisting of at least one of a sensory neuron stimulator, a transcranial electrical stimulator, a transcranial alternating current stimulator (tACS), a transcranial magnetic stimulation (TMS), a visual stimulator, an auditory stimulator, a tactile stimulator, a proprioceptive stimulator, a somatosensory stimulator, a gustatory stimulator, an olfactory stimulator, a pain stimulator, a thermal stimulator, a spinal cord stimulator, a transcranial pulsed ultrasound (TPU) stimulator, a noninvasive deep brain stimulator, a cochlear implant stimulator, a deep brain stimulator, a retinal electrical stimulator, a microelectrode array stimulator, a vagus nerve stimulator, an electrical brain stimulator, and a focal brain stimulator.
 18. The apparatus according to claim 12, wherein the means for digitally processing comprises a statistical classifier configured to classify the electrical brainwave neural correlates associated with the mental process of the first subject, and classification of at least one Bereitschaftspotential.
 19. The apparatus according to claim 12, wherein the mental process comprises at least one of a musical instrument playing skill, a musical skill, a singing skill, a dancing skill, a sports skill, a martial arts skill, a speech skill, a calligraphical skill, a drawing skill, a painting skill, a massage skill, an assembly skill, a walking skill, a running skill, a swimming skill, a yoga skill, a fighting skill, a shooting skill, and a self-defense skill.
 20. The apparatus according to claim 12, wherein the means for subjecting comprises an electronic device configured to produce a stimulus selected from the group consisting of a peripheral neural stimulation and a central neural stimulation of the subject, the stimulus having a modulation corresponding to a neuronal activity pattern defined by a recording of brainwaves of the first subject.
 21. The apparatus according to claim 12, wherein the means for subjecting comprises a binaural stimulator configured to at least one of: induce a desired predominant brainwave frequency in the subject; expose the subject to an isochronic tone; and expose the subject to binaural beats.
 22. The apparatus according to claim 12, wherein the means for subjecting comprises a binocular stimulator configured to present optical signals having different modulated optical signals to each respective eye.
 23. The method of claim 12, wherein the means for subjecting is configured to concurrently electrically or magnetically stimulate different parts of the subject's brain with signals having different frequencies.
 24. The apparatus according to claim 12, wherein the means for subjecting comprises an auditory stimulator configured to produce acoustical patterns having a time-varying pattern corresponding to the electrical brainwave neural correlates associated with the mental process of the first subject while the first subject is performing the motor task.
 25. The apparatus according to claim 12, further comprising: an input configured to receive brainwave signals from the first subject; the means for digitally processing comprises at least one processor configured to process the received brainwave signals to define a neuronal activity modulation pattern; and the means for determining is configured to perform a wavelet transform on the neuronal activity modulation pattern, wherein the first subject and the second subject are the same subject at different times.
 26. The apparatus according to claim 12: wherein the extracted modulated brainwave pattern comprises a sequence of a plurality of patterns of brainwave activity of the first subject while performing different aspects of the motor task; and the stimulus comprises a sequence of a plurality of phases respectively representing the plurality of patterns or brainwave activity.
 27. The apparatus according to claim 12, further comprising at least one processor configured to: analyze an input received from the second subject to determine a Bereitschaftspotential indicating readiness to perform the motor task, and control the stimulator dependent on the determined readiness to perform the motor task. 